Electrical engineer, nurse identified after teen son allegedly shot them, 3 siblings

An electrical engineer in Washington state and his nurse wife, who were allegedly murdered in their mansion by their teen son alongside three of his siblings, have been identified.

Mark Humiston, 42, his wife, Sarah, and three of their teenage children were found fatally shot earlier this week inside their massive $2 million home, located in the Seattle suburb of Fall City.

Deputies with the King County Sheriff’s Office were called to the residence on Monday around 5 a.m. to investigate reports of a “disturbance with gunfire,” authorities said in a statement. When they arrived on the scene, they found the five family members already deceased and a sixth victim who was seriously injured. She was taken to Harborview Medical Center in Seattle, where she was listed in “satisfactory condition” as of Tuesday, a hospital spokesperson told CNN.

While authorities have not identified the surviving victim, neighbors have said the Humistons lived in their home in the Lake Alice neighborhood — one of the most expensive in the country — with their five children.

“It does appear to be that this is a family incident, clearly a domestic violence incident involves not only a young man who’s now in significant trouble, it involves firearms. Young men and firearms,” Mike Mellis, a deputy and spokesperson for the sheriff’s office told reporters.

The suspect, identified only as the Humiston’s 15-year-old son, was taken into custody, but he has not yet been charged. Police said he d does not have a criminal history.

Mark Humiston, originally from Texas, was a well-known electrical engineer and spent the last two decade working with Hargis Engineers. Sarah, meanwhile, previously worked as a registered nurse, King 5 reported.

“We are blindsided and saddened by the tragic events that have led to the loss of a respected colleague, mentor, and friend, as well as the loss of immediate family members,” Hargis Engineers said in a statement to King 5. “Mark’s leadership and vision were integral within our firm, and he will be greatly missed. Our thoughts are with his surviving family, friends, and colleagues during this difficult time.”