On his behalf, actor Kate Mara accepted the honour, presented by British Academy of Film and Television Arts Los Angeles, reported E! online.
"Unfortunately, Matt has urgently needed to travel back 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," she said.
"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," he said.
Mara attended the award ceremony with husband Jamie Bell.