Investigators say a 42-year-old Sioux Falls man bought two teenagers vodka just hours before they rolled their car and died.
Raphie Phan, 17, and his 19-year-old girlfriend Amanda Doty died on a rural Minnehaha County road near the Sioux Falls landfill just after midnight on Sunday morning.
Tyrone Gastineau was arrested Friday for allegedly giving them the alcohol that caused the crash.
Investigators were led to Gastineau just days after the crash after receiving an anonymous tip. On Thursday, after a Division of Criminal Investigation Agent questioned him, Gastineau admitted to buying the teens alcohol.
Test results released Friday show that Phan was just over the legal limit with a blood alcohol content of 0.096. Doty was a passenger in the car and nearly five times the legal limit at 0.393.
Court documents say alcohol containers were scattered around the crash scene. Among those containers was a broken bottle of vodka, the same vodka authorities say Gastineau admits he bought for the teens just hours before the crash.
Gastineau told investigators Phan and Doty came to his apartment on Saturday night and drove him to a Sioux Falls liquor store. They gave him $25 in cash, he bought them the vodka, and then they drove Gastineau back to his apartment.
Gastineau says he wasn't aware of any parties the two were going to and he says that Phan told him that they were going back to Phan's house to drink.
An arrest warrant filed Friday afternoon says the person who called in the anonymous tip Wednesday said Gastineau was told about the crash on Sunday and he 'felt bad' about what happened.
All of the charges Gastineau faces are misdemeanors.
He's expected to appear in court on Monday.