LEMONT, Ill. -- Chris DiMarco withdrew from the Cialis Western Open on Tuesday evening due to the passing of his mother, Norma. She suffered an apparent heart attack just after arriving in Colorado for vacation on Tuesday.

"We were saddened to hear of the passing of Chris’ mother," said Cialis Western Open Tournament Director John Kaczkowski. "Our thoughts and prayers go out to him and his family for their loss."

Further details will be forthcoming.