O.J. Simpson, the decorated football superstar and Hollywood actor who was acquitted in a criminal trial for the murders of his ex-wife and her friend, but later found liable in a separate civil trial, has died at 76. A message posted Thursday on Simpson’s official X account said he died after battling cancer. Simpson earned fame, fortune and adulation through football and show business, but his legacy was forever changed by the June 1994 knife slayings of his ex-wife, Nicole Brown Simpson, and her friend Ronald Goldman in Los Angeles. Live TV coverage of his arrest after an infamous slow-spee…