LIAM'S ENDLESS GUILT

GUILT-STRICKEN Liam Neeson still struggles to forgive himself for pulling the plug on his wife, Natasha Richardson, in 2009 after the 45-year-old actress suffered a fatal injury while skiing — even though the Irish screen stud once promised he'd never leave her languishing on life support, sources say.

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The actor has remained unmarried since the 2009 tragedy

According to a tipster, Liam, now 73, rushed to Natasha's side at the New York City hospital where his wife of 15 years was flown after falling and hitting her head at a resort in Canada and experiencing an excruciating headache.