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UA students Josiah Santos, 22, Sophia Troetel, 21, and Katya Castillo-Mendoza, 21, were walking in a marked crosswalk at North Euclid Avenue and East Second Street at about 11 p.m. Thursday.

They were fatally struck by a 2019 Porsche Boxster that police say was driven by Louis John Artal, 19.

Police said Artal was speeding and under the influence of alcohol and/or drugs at the time of the crash and that he fled before turning himself in about an hour later.

According to an interim complaint filed in Pima County Justice Court, Artal called 9-1-1 a little over an hour after the crash and later turned himself in at a Tucson police station.

"I responded to the police station and observed (Artal) at the front door and he told me he was on the phone with 911. I could see dried blood on the front of his jeans," the arresting officer wrote in a statement of probable cause. "I could immediately see that he had bloodshot watery eyes, his speech sounded slurred and I could smell the strong odor of intoxicants on his breath."

The officer did not say or speculate where the blood came from.

The officer said he read "the Miranda warnings" to Artal, and "he told me he last consumed alcohol at around 10:30 p.m. and that he had been involved in a collision."

"I continued questioning Artal and he stated he was traveling on Euclid and struck three people. Artal stated he left the scene because his apartment was nearby and he left his vehicle there," the officer wrote. "Officers located the vehicle (at the home address Artal provided). He denied consuming any drugs or alcohol after the crash."

Artal faces three charges of second-degree murder and one count of leaving the scene of an accident resulting in death. He is being held in the Pima County jail; bond is set at $250,000. 

He has a California driver's license, police said. His attorney has said he is a UA student from San Francisco.