The Downsizing star’s father, Kent Damon, died on December 14 at the age of 74 following a seven year battle with cancer.
Matt’s dad had been fighting bone marrow cancer since 2010, but his health took a turn for the worse as multiple myeloma spread through his body.
George Clooney’s best pal made a heartfelt plea for the public to pray for his dad earlier in December, telling Extra: “It’s been a slow … unfolding, my dad’s sick, so that’s been a process we’re going through.
“We’ll take any prayers you got, so throw ’em up there.”
The news comes after the Hollywood star pulled out of the BAFTA Britannia Awards in October and rushed to by his father’s side in his hometown of Boston, Massachusetts.
Actress Kate Mara collected the Stanley Kubrick Award for Excellence in Film accolade on his behalf, and delivered an emotional speech about the Good Will Hunting star.
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“Unfortunately Matt has urgently needed to travel to Boston and couldn’t join us tonight.
“As much as we wish he was here with us, we know family comes first. So our thoughts are with you, Matt, and much love from your friends here in LA.”
Matt – who has cancelled some promotional duties on Downsizing – added in a video message: “Hello and thank you to everyone at BAFTA.
“I found out about this award six months ago and I was just so incredibly honoured to receive it and I was really looking forward to tonight.
“Unfortunately, I had to go back to Boston for a family emergency. I’m really sorry not to be with you tonight.
“Thank you for this wonderful honour and I hope you have a lovely evening. See you soon.”