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Cellphones and social media were at the heart of the investigation that led to an arrest in the killing of a University of Utah student who vanished nearly two weeks ago.Investigators tracking her cellphone discovered that 23-year-old Mackenzie Lueck and the man expected to be charged with her murder were both in the park where she was last seen on June 17 within a minute of one another.That was around the time Lueck's phone stopped receiving data or location services, police said.Ayoola Ajayi, 31, was arrested Friday and is expected to be charged with aggravated murder. He also faces charges of aggravated kidnapping, obstruction of justice and desecration of a body, according to Salt Lake City Police Chief Mike Brown.Police find her pictures on his phoneAfter Lueck disappeared, the suspect originally denied knowing what she looked like, Brown said. But several pictures of her were found on his phone, and the "digital footprint" has continued even after the arrest, police said.An Instagram account that Lueck's sorority sister confirmed belongs to the missing student followed another user on or about Wednesday, CNN verified.Brown confirmed that investigators are looking into the activity on the account."This is a digital forensic investigation," he said. "This is covering computers, cellphones, IP addresses, URLs, texting apps."Forensic evidence is also discovered But the investigation is not just limited to digital footprints.Investigators also found forensic evidence after they searched Ajayi's home and property Wednesday, police said. As they did, his neighbors told police they saw him using gasoline to burn something in his backyard on June 17 and 18, Brown said.Police said the search yielded multiple items of evidence."A forensic excavation of the burn area was conducted, which resulted in the finding of several charred items that were consistent with personal items of Mackenzie Lueck," Brown told reporters.Police also discovered charred material that was determined to be female human tissue consistent with Lueck's DNA profile, he said. A mattress investigators have been trying to find has been located, police tweeted Friday night, without providing additional details.She stopped communicating about 3 a.m. Lueck texted her parents at 1 a.m. on June 17 when she landed at Salt Lake City International Airport, police said. She was seen on airport surveillance walking through baggage claim before taking Lyft to Hatch Park.The Lyft driver said she did not appear to be in distress, according to Salt Lake City police assistant chief Tim Doubt.Police said Friday that all communications with Lueck's phone ceased around 3 a.m. that morning -- the same time they said she left the park with the suspect.Phone records showed her last communication was with the suspect, Brown said. Her family and friends did not see or hear from her after that morning. Her sorority sister told CNN affiliate KSL that Lueck had also missed exams."She's extremely dedicated," Ashley Fine told the TV station. "She would never miss her midterms or anything like that. She hasn't been home. She didn't show up to work, or anything."A suspect is arrested After the suspect's arrest Friday, Brown contacted her parents to tell them the news. They were "devastated and heartbroken by this news," he said."This is one of the most difficult phone calls I've ever made," he said.The suspect lived about five miles from the park where Lueck was last seen.According to his LinkedIn page, he is a former information technology specialist for the US Army and recently worked for Dell and Goldman Sachs. CNN has reached out to the US Army and Dell for comment. 3686

Dollar General keeps expanding even as discount rivals like Family Dollar shrink.The company said Thursday it will open 975 new stores in the United States this year. Dollar General will remodel 1,000 older stores with new queue lines to drive last-minute impulse buys. It will also spruce up its health and beauty sections to lift sales.Dollar General has been growing for years in rural America. Dollar General opened 432

DERRY, N.H. — A New Hampshire town waited 50 years to open a time capsule, only to find the big surprise was ... nothing.Derry's time capsule was sealed in 1969, and for as long as Cara Potter has served as director of the Derry Public Library, the capsule has sat on the same shelf."Nobody touched it until last spring," Potter 346

DJ Kashief Hamilton says he was playing music on a cruise ship dock at St. Thomas in the US Virgin Islands when he heard a loud scream. The DJ stopped the party.He says he saw people running, including friend Randolph Donovan, with whom he works as an entertainer for visitors to the island.The 34-year-old Donovan jumped about 10 feet down off the dock into the ocean. A young woman in a wheelchair was sinking."I got her out of her wheelchair," Donovan told CNN. Someone on the dock threw down a life preserver, he said.Then Hamilton, 33, says he jumped in to help his friend, who was holding up the young woman, kicking furiously to keep the two of them afloat. "I can't go no more," Donovan told Hamilton.Hamilton said the water was about 35 or 40 feet deep where they jumped in, making it more than deep enough for the woman weighted down by her wheelchair to sink.Together with onlookers atop the dock, Hamilton and Donovan pulled the young woman back up to safety.They never got her name, but they said one of her family members gave them a big hug."I'm glad the outcome was something positive," Hamilton said. "We would have lost someone who is both a family member and a passenger."They easily could have lost their own lives, too, if a gust of wind had buffeted the waves, moving the massive Carnival Fascination cruise ship parked at the dock. If the ship had shifted a few yards, the three could have been crushed against the dock, Hamilton said.A spokeswoman for Carnival Cruise Line declined to identify the passenger who was rescued, but told CNN, "The guest was seen by our medical team and did not sustain injuries. A complimentary replacement wheelchair has been provided for the duration of the cruise."Strangers now call them heroesHamilton and Donovan said the governor and a legislator applauded their rescue efforts.The two men said US Virgin Islands Gov. Albert Bryan, Jr. called them and told them, "On behalf of the people of the Virgin Islands, I want to say thank you." 2009

Earlier this month, the US Air Force ended height restrictions for pilots in hopes of attracting a more diverse pool of candidates, which the Air Force hopes will result in more female applicants. The new rules went into effect on May 13 for applicants.Previously, pilots were required to stand 64 to 77 inches tall. The Air Force said that medical and operations communities will apply an anthropometric screening process to individual applicants for placement in an aircraft they can safely fly as they pursue a rated track. The Air Force says that its previous requirement eliminated about 44% of female applicants age 20 to 29. “Historically, most of our aircraft were engineered around the height of an average male, not females,” said Lt. Col. Jessica Ruttenber, Air Force mobility planner and programmer and team leader on the Women’s Initiative Team.Government data says that the average American adult woman stands 63.8 inches tall, while the average man in the US stands 69.3 inches. The Air Force had a waiver process that allowed applicants who didn’t meet height requirements the opportunity to be considered, but the Air Force said that the process could have scared off applicants. “While most height waivers were approved under the old system, feedback indicated the entire waiver process served as a barrier, which negatively impacted female rated accessions,” said Lt. Col. Christianne Opresko, branch chief on the Air Force’s Air Crew Task Force and an aerospace physiologist. “It’s hard to determine how many women did not previously apply due to their perception of not being fully qualified or having to pursue a waiver.” 1655