A 31-year-old man prosecutors say had drugs in his system when he crashed his car in Casper, killing one of his passengers and injuring two others, has pleaded not guilty to three felony charges.

The Associated Press reports Larry Ronald Turner Jr. appeared in District Court on Tuesday and denied one count of aggravated vehicular homicide and two counts of aggravated assault. He remains free on $100,000 bond.

Court records say Turner was driving 109 mph just five seconds before crashing near a Casper intersection at about 3:15 a.m. Oct. 12. Authorities say 24-year-old Dylan Brock of Casper was killed, and two other passengers were injured.

Turner also was hurt in the crash.

Authorities say his blood tested positive for mephedrone, a drug described as a stimulant and hallucinogen.