Detective William Osborn was laid to rest at Friends Church in Yorba Linda.
Osborn and Detectives Joshua Kelley-Eklund and Victor Lemus were part of the Special Enforcement Bureau's Arson Explosives Detail, with a collective 74 years of service.
Last month, they were handling two grenades that were believed to be inert when one suddenly exploded.
Kelley-Eklund will be laid to rest later this week, while services for Lemus are set for next week.
Osborn, known to family and friends as Bill, is survived by his wife, Detective Shannon Rincon, along with his four sons and two daughters.
"Bill was one of our best. And personally responsible for rendering hundreds of devices safe and protecting the lives of so many in our community," said Sheriff Robert Luna.
His family described him as selfless, a jack-of-all-trades and a dedicated family man.
"My dad was one of the most hard-working people I know. He was also one of the most humble people I know. He would actually probably be trying to wave all this attention off even though he deserves every bit of it. He worked his butt off with the department for over 33 years and I wish he could have been able to enjoy his retirement," she said.
His family said Osborne was a big fan of the New York Yankees.
"We mourn the loss of Bill Osborn. All of us in the Yankees family are thinking about you, praying for you and sending our heartfelt condolences to you guys," said Yankees Manager Aaron Boone in a video message shared during the funeral.
His kids shared their favorite memories of their father, and his wife Detective Rincon read remarks from their younger son. Fighting back tears, she also shared what he means to her.
"Beyond the uniform and beyond the badge, he was mine. He was my partner, my best friend, my safe place and my whole world. My everything," she said.
His family says his dedication was evident to everyone who knew him and worked with him, and he will be forever missed.