Charlie Sheen has written an open letter to Ashton Kutcher apologizing for his recent criticism of the actor, admitting his comments were "disrespectful".

Sheen hit headlines last week when he called in to internet news show TMZ Live to rant about his Two and a Half Men replacement, saying, "I'm tired of pretending the show doesn't suck... I'm tired of pretending Ashton doesn't suck."
 
"It's nothing personal... I just feel bad for him... He's saddled with such bad writing."

Sheen has now issued an apology to Kutcher, but he stands by his criticism of the show.

In an open letter, obtained by TMZ.com, Sheen writes, "Dear Ashton, My bad. I was disrespectful to a man doing his best. I got excited and I threw you into the crossfire, but the rest of my statement I stand behind."

"You however, deserve better. Safety in your travels good sir."
 
Sheen was fired from the show last March after months of erratic behavior and Kutcher was subsequently hired to take over.