Luke Campbell has revealed his father died two weeks before Saturday's WBA lightweight title defeat by Jorge Linares in California.
Campbell's dad, Bernard, was diagnosed with cancer in 2014, prompting the 2012 Olympic gold medallist to take time away from boxing.
"I probably cried once a day. I had to try and shut feelings off. After the fight I had a good cry," the 29-year-old told BBC Sport.
"I didn't want anyone to know."
Campbell added: "If someone had found out I would have denied it. I didn't want Linares' camp thinking it was a weakness. I didn't want them thinking I was hurt.
"The only thing that kept me going is I know what my dad would have wanted for me. To fight and to win."
Campbell lost on a split decision to Linares, 32, having recovered from being knocked down in the second round.
Scot Victor Loughlin had Campbell winning 115-113, but the other two judges gave it to the Venezuelan with scores of 115-112 and 114-113.
'I think I did my dad proud'
- Title: Luke Campbell reveals his father died two weeks before Jorge Linares fight
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- Date: 4:38 PM