John Corcoran, the brother of "Shark Tank" star Barbara Corcoran, has died.
A rep for Corcoran confirmed his death to NBC News.
John Corcoran died of an alleged heart attack in April while vacationing in the Dominican Republic where three other American tourists have recently died.
His death does not appear to be related to the other Americans' deaths.
Barbara Corcoran, 70, told TMZ on Wednesday that John, a retired business owner from New Jersey, was on vacation with a friend and it was John's friend who found him dead in his hotel room.
Corcoran was told her brother died of a heart attack but she said she doesn't believe an autopsy was performed on John's body.
The real estate investor, who has nine siblings, called John "my favorite brother" and described him as having a larger-than-life personality.
She said John was waiting for his girlfriend to join him on his trip when he passed away.
The news of her brother's death has emerged during a high-profile time for Dominican Republic tourism.