The Snohomish County Sheriff’s Office said Monday they have arrested a 56-year-old Lynnwood man in connection with the death of his 88-year-old father, from Edmonds, on Dec. 2, the result of injuries suffered when the son struck the father a few days after Thanksgiving.

According to the Sheriff’s office, the son and his adult children went to his parents’ home in unincorporated Edmonds on Thanksgiving. During the holiday, the 56-year-old man’s daughter complained that her 88-year-old grandfather had inappropriately touched her. Later in the day, the young woman’s father witnessed a second alleged incident during which the elderly father inappropriately touched his granddaughter.

Two days later, the 56-year-old son returned to his father’s house to confront him. The elderly man denied any knowledge of such behavior and the two got into a heated argument. Twice during the argument, the son slapped his father on either side of his head hard enough to cause the man’s hearing aids to come out of his ears.

On Dec. 1, the man became ill and his wife called medics. He was taken to Harborview Medical Center in Seattle, where doctors discovered he was suffering from a subdural hematoma. He died in the early morning hours of Dec. 2. When his wife told doctors about the earlier fight between her husband and son, doctors concluded that the son’s slaps caused the man’s head injury.

Detectives arrested the 56-year-old son on Sunday, Dec. 6, and booked him into the Snohomish County Jail on one count of second-degree murder. The case remains under investigation. The victim’s name hasn’t been released pending an autopsy by the Snohomish County Medical Examiner’s Office.