TOPEKA, Kan. (AP) — A Junction City man was sentenced Wednesday to life in federal prison for killing a woman to stop her from giving information on his drug trafficking to federal law enforcement officers.

U.S. Attorney Barry Grissom says Marcus D. Roberson was convicted in March 2014 of murder, and conspiracy to distribute crack and powder cocaine.

Prosecutors say Roberson shot the victim four times in central Junction City. Her body was found in her vehicle and the murder weapon was found in a pond behind a Junction City Walmart.

Prosecutors also presented evidence of Roberson’s involvement in a ring that distributed powder and crack cocaine in the Junction City area.

Seven co-defendants have been sentenced in the case.