WILLMAR, Minn. - Three teens have been charged in the murder of a 79-year-old Willmar woman, Lila Warwick,who was found strangled and stabbed Monday night.

Among those charged was Warwick's grandson, 17-year-old Robert I. Warwick. Hewas charged with two counts of second degree murder.

Also charged were Brok N. Junkermeier, 19, and DevonJ. Jenkins, 16, both of Willmar. Junkermeierwas charged with one count of second degree murder and Jenkins was chargedwith two counts of second degree murder.

Prosecutors say Junkermeier saidRobert Warwickthoughthis grandmotherhad $40,000 in a safe, so they plotted to steal it.

Police say Junkermeier broke into Warwick's home, cut her with a sword-like knife and forced her to write out a $1,500 check. Police say he then strangled her, repeatedly stabbed her, then threw her downstairs.

Robert Warwick admitted to giving Junkermeier the garage code to get into Lila Warwick's residence. He told police he was supposed to get $300 from the robbery of his grandmother.

Junkermeier and Robert Warwick returned to Lila Warwick's homeafter her murder to steala safe.

According to the complaint, Jenkins had driven with Junkermeier to Lila Warwick's house in the early morning hours Monday and fell asleep in the car. Jenkins admitted to police that whenJunkermeierreturned to the car several hours later, hetold him that he had murdered Lila Warwick.

It was not immediately clear if Junkermeier had an attorney.