FARMINGTON, Mo. -- An eastern Missouri woman has been sentenced to life in prison after admitting she killed a man.

The Daily Journal newspaper in Park Hills reported that 37-year-old Robin Lucas of rural Bonne Terre, Mo., pleaded guilty Friday to second-degree murder. She originally was charged with first-degree murder in the shooting death of Thomas Triplett Jr. but reached a plea deal with prosecutors.

Drug investigators went to Lucas' camping trailer April 21, 2011, on an anonymous tip about a methamphetamine lab. No arrest was made, but Triplett was shot the next day.

Witnesses told police Lucas thought Triplett was the anonymous tipster. She admitted during her plea hearing that she shot Triplett.

------

Information from: Daily Journal, http://dailyjournalonline.com