Olathe ? An alleged methamphetamine dealer from Topeka man has admitted to killing a mother of five at a Johnson County hotel because he thought she was a police informant.

The Kansas City Star reported that 37-year-old Jason Munjak pleaded guilty Friday to a charge of felony first-degree murder for killing 37-year-old Toby Marie Rock of Topeka. Munjak also pleaded guilty to distributing methamphetamine.

The prosecution said Rock was killed Jan. 19 when she went to the Merriam hotel to buy methamphetamine from Munjak. A witness later told detectives that Munjak began acting nervously when Rock showed up. Rock reportedly asked Munjak what was wrong, and then he shot her in the head.

The prosecution said Munjak confessed to police.

Sentencing is scheduled for May 30 in Johnson County District Court.