Veteran Melbourne forward Danny Williams has written a letter of apology to Wests Tigers' Mark O'Neill for the king hit that could land him a long suspension.

Williams says he's ready to accept whatever ban is imposed by the NRL judiciary.

Williams said in the dressing rooms after Saturday's match he had trouble recalling what happened when he ran and flattened O'Neill having taken a knock to the head in O'Neill's high tackle seconds earlier.

The Storm issued a statement saying Williams had expressed his remorse over the "unsavoury" incident which had him sent off in the 65th minute of the 32-18 loss to the Tigers at Leichhardt Oval.

"I have written to Mark to say sorry and that I strongly regret and am ashamed of my actions during Saturday's match," Williams was quoted as saying.

"Clearly it was unacceptable, there's no excuse for that kind of behaviour and I deeply regret what took place.

"The whole thing is extremely regrettable. It's now in the hands of the judiciary and obviously I will accept whatever penalty they decide to hand down."

Playing his 100th first grade match, a dazed O'Neill was helped from the field and taken for x-rays and initially cleared of a broken jaw although he was to undergo more tests.

Williams was sent off by rookie referee Gavin Badger.

He took exception to a high tackle from O'Neill - for which the Tigers forward was placed on report - before moving in and flooring O'Neill from behind.

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