Mark La Mura of 'All My Children' dead at 68

Mark La Mura, an "All My Children" staple for the past several decades, has died. He was 68.

"How can this be? I just received the shocking and deeply saddening news that wonderful Mark LaMura has passed away," former co-star Susan Lucci wrote on Instagram. "Mark played my brother Mark on All My Children--he was such a talented and accomplished actor/ a bright and charming presence in all our AMC lives--and a really great guy. Mark was loved and he will be missed!"

La Mura, who was nominated for a Daytime Emmy in 1988, began playing Pine Valley's Mark Dalton nearly four decades ago. His most significant storylines included the romantic pursuit of his own sibling, Erica (Susan Lucci) -- he didn't yet know they were related -- and an intervention for drug addiction.

Viewers may also know La Mura from dozens of other TV appearances, including roles on "30 Rock," "The Sopranos" and "Law & Order: SVU."