SOUTH MILWAUKEE, Wis. (CBS 58) -- A 15-year-old boy from South Milwaukee is being charged as an adult with first-degree intentional homicide in the death of his grandmother, according to a criminal complaint filed Friday, Sept. 5.

Investigators said police were called to a home near the corner of 17th and Oak. on Wednesday, Aug. 27 for a report of a person not breathing. Officers reportedly found the suspect's 68-year-old grandmother on the kitchen floor.

She regained a pulse but died on Sunday, Aug. 31, according to the complaint.

The Milwaukee County Medical Examiner’s Office reported evidence of strangulation. The complaint said the teen initially told police that his grandmother collapsed after a seizure, but later admitted he strangled her for about five minutes.

Ring doorbell footage showed no one else entered or left the home that day. The victim's husband told police she previously reported being choked by her grandson months earlier.

In court on Monday, Sept. 8, a judge set the 15-year-old boy's bond at $100,000.