DALLAS -- A jury deliberated without reaching a decision on Monday in the punishment phase for former Dallas Cowboys cornerback Dwayne Goodrich, who struck and killed two men with his luxury car while speeding home from a night at strip clubs.

Deliberations were to resume on Tuesday morning.

The same Dallas jury on Friday found Goodrich, 25, guilty of criminally negligent homicide, which carries a sentence of up to 10 years in prison on each count.

Prosecutors were seeking a conviction on charges of manslaughter, which could bring a stiffer sentence of up to 20 years in prison on each count.

Goodrich faces a maximum of 20 years in prison. During testimony in the punishment phase, the jury heard from family members of the victims as well as a psychiatrist who said he did not believe the former football player posed a threat to society, Reuters reported.

Goodrich killed Joseph Wood, 21, and Demont Matthews, 23. The two had stopped to help a motorist in a separate accident flee from a car that was on fire, police said.

Witnesses said they saw Goodrich speeding through the accident scene at about 100 miles per hour (160kph) as his BMW slammed into the Good Samaritans and sent them skyward. Goodrich contends that he was going about 75 mph (120kph) and his view of the crash scene was obscured by a vehicle ahead of him.

Goodrich turned himself in to police several hours after striking the men on a Dallas highway in January.

Goodrich was a second-round draft pick for the Cowboys, who play in the National Football League. He was drafted from the University of Tennessee in 2000. He saw limited action with the team as he battled injuries and poor performance on the field.

He was cut from the team after the hit-and-run accident.