Charlie Sheen signs custody of daughters over to Denise Richards

denise_richards-charlie-sheen-daughters.jpg Charlie Sheen is currently working on a plea deal with Colorado prosecutors over his December 2009 incident where he allegedly threatened and assaulted his wife Brooke Mueller. But now TMZ has learned that he has relinquished custody of his two young daughters 6-year-old Sam and 4-year-old Lola to ex-wife Denise Richards.