LOS ANGELES —  "Married With Children" star Christina Applegate’s boyfriend was found dead in his apartment on Tuesday, FOX News has learned.

• Click here to view photos of Christina Applegate.

"I am profoundly saddened," Applegate said of Lee Grivas, 26, in a statement to Usmagazine.com. "Lee was an incredible human being who was an extremely important and beautiful part of my life."

A neighbor found the body on Tuesday evening in the living room of his Hollywood apartment, TMZ reported on Thursday.

Grivas and Applegate, 36, dated on and off for years after meeting through a performer in her "Sweet Charity" Broadway show.

Grivas allegedly had a history of drug abuse, and an autopsy report was pending.

Click here to read more on this story from Usmagazine.com.

Click here to read more on this story from TMZ.com.