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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

Democrats argued that President Donald Trump sought a phony investigation of a political rival and pursued a discredited conspiracy theory about Ukraine, while restless senators played with a new toy Thursday during Trump's impeachment trial. Democrats said there was no evidence that former Vice President Joe Biden did anything improper in dealings with Ukraine. Republicans outside the chamber challenged Democrats' argument and pledged to find out more about Biden and his son’s dealings in Ukraine. Meanwhile, senators found a new outlet to focus their attention: fidget spinners handed out by North Carolina Sen. Richard Burr.Chief justice's admonishment followed a note from CollinsSupreme Court Chief Justice John Roberts' admonishment to House impeachment prosecutors and President Donald Trump's defense team followed a note written by Sen. Susan Collins of Maine. Collins' spokeswoman confirms that the Republican penned the note after House Judiciary Committee Chairman Jerry Nadler's comment about a “cover-up” by Senate Republicans for Trump. After receiving the note, Roberts admonished both sides around 1 a.m. Wednesday. Collins indicated afterward that she'll make her decision on impeachment on the facts that are presented, and said Nadler's comments won't affect her decision.Schiff sets tone with appeals to SenateRep. Adam Schiff is the face of the House’s impeachment case against President Donald Trump. Though he has six managers by his side, Schiff is setting the tone, working methodically to convince the Senate Trump deserves to be removed from office. Schiff told The Associated Press in an interview Thursday it is like he is “introducing myself to a number of the senators” at Trump's impeachment trial. He said many Republicans are “finding I'm not the demon” that he's often portrayed to be. Republicans were complimentary of Schiff but said they learned nothing new about the case against the president. 1951

DENVER – Trail Ridge Road in Rocky Mountain National Park remains closed Monday after another round of snow and high winds over the weekend left drifts of up to 5 feet in some places.Rangers 203

Deputy Attorney General Rod Rosenstein is planning to leave the Justice Department shortly after William Barr, the President's nominee for attorney general, is confirmed, according to a source familiar with his thinking.The source said Rosenstein is not being forced out, and he has conveyed his thinking to the White House.Barr's Senate confirmation hearing begins January 15, which means a confirmation vote at the earliest would occur in mid-February.Rosenstein's plans were earlier 498

DETROIT — Jaden Smith is helping the residents of Flint, Michigan, through a new initiative. The rapper, actor and co-founder of the eco-friendly company JUST Water has partnered with a local Flint church to deploy a mobile water treatment system. The system is called "The Water Box" and it filters out lead and additional contaminants in water, according to a press release. Flint's water crisis began in April 2014 after the city's water source was switched from the Detroit River to the Flint River, which resulted in city-wide lead contamination of public drinking water. First Trinity Missionary Baptist Church in Flint has been on the front line of the battle to restore drinkable water in the city. The church has also given out more than 5 million bottles of water to local residents. In 2018, the free bottled water program set up by the state was ended under former Gov. Rick Snyder. However, a recent announcement by newly appointed Michigan Gov. Gretchen Whitmer states that the program will be 1020