The resort where the couple were staying confirmed to NBC News that a male guest drowned while freediving alone outside the underwater room on Thursday.
"You're hanging your dog," a man's voice is heard on the video telling the suspect in Tarpon Springs, Florida.
The 6-year-old's grandmother said the girl was acting out because of a sleep disorder.
The star wide receiver was cut by the New England Patriots last week amid sexual assault allegations.
All seven victims were wearing orange paper wrist bands and police are trying to locate the venue that was distributing them.