Neil Patrick Harris Mourns Death of 'Doogie Howser M.D.' Dad James B. Sikking

Neil Patrick Harris is mourning the death of his TV dad James B. Sikking.

The 51-year-old actor and James starred together on the ABC medical sitcom Doogie Howswer, M.D., which ran from 1989 to 1993.

On Sunday (July 14), James died at the age of 90. His publicist confirmed to People that James died “peacefully at his Los Angeles home surrounded by family.” The cause of death was dementia.

Following James‘ death, Neil took to Instagram to honor his late co-star.

Keep reading to find out more…“Jim Sikking played my dad in Doogie Howser, MD, and was one of the kindest, wisest, funniest, and most generous people I’ve ever known,” Neil wrote.

“A true professional. He treated everyone with respect, taught me countless lessons, yet always had a spark of mischief in his eyes,” Neil continued. “It was an absolute honor to be his son. My condolences to his actual family for their loss. #RIP”

Our thoughts are with James B. Sikking‘s loved ones during this difficult time. We have sadly lost so many stars this year.