Coast Guard calls off search for father of 2 who mysteriously disappeared from Carnival cruise ship, sister says: 'No one just vanishes into thin air'

A Florida man disappeared during a recent vacation on a Carnival cruise ship. The family is searching for answers after the father of two mysteriously vanished during a cruise trip.

Kevin McGrath was on the Carnival Conquest cruise ship to celebrate his father's 60th birthday. However, he vanished without a trace during the final hours of the three-day cruise to the Bahamas.

The family grew suspicious when McGrath failed to show up for breakfast around 7:30 a.m. on Monday. The family notified the cruise crew, but matters were complicated since the Port St. Lucie native was reported missing at the same time as everyone was disembarking the ship at the PortMiami seaport.

McGrath, 26, was reportedly last seen by his brother at about 2 a.m., and his key card was last used to enter his room around 3:30 a.m.

Cellphone footage last shows him dancing on Saturday night.

Authorities conducted an "extensive search" of the cruise ship after it docked in Miami on Monday.

U.S. Coast Guard crews searched for more than 80 hours and covered 3,300 square nautical miles off the coast of Florida but could not locate the missing man. Miami-Dade police and Fire Rescue and the Florida Fish and Wildlife Conservation Commission also participated in the search and rescue mission.

The Coast Guard called off their search on Thursday.

Authorities say the ship's overboard detection system never indicated that McGrath fell off the ship, and there is no evidence that the man went overboard during the cruise.

Carnival confirmed to WPLG that McGrath "was not detected by surveillance systems, including U.S. Customs and Border Patrol during the debarkation process."

McGrath's father told WPEC, "His SeaPass card was not scanned, because when you exit the ship, you have to scan your SeaPass card, and we had his documents, like his birth certificate and driver’s license, so there’s no way he could come off the ship. I was told from Carnival that they had sensors all around the ship, so if someone did go overboard, they would’ve been alerted, and nothing was alerted."

His sister, Danielle McGrath, told USA Today, "Everyone has different relationships with the person but me, how I know my brother, how I last spoke to him, his energy, his spirit. This is definitely not like him."

"This is not like him and he would never disappear like this," she added. "He is also a father of two kids. He would not disappear."

"We have no answers. My family and I have no answers," she told ABC News. "No one just vanishes into thin air. Where's my brother?"

The sister told WTVJ, "My brother didn’t just vanish. Someone knows something. Someone’s seen something. I just want my brother home. My family wants my brother home. Just please, we need him home."

"There’s so many scenarios that run through my head," she said. "Did he fall somewhere, and he’s screaming for help, and no one hears him? Did he fall down an elevator shaft? I just don't know. It's just anything."

McGrath's father hopes that his son's "training and survival skills" from being an Army veteran will help him get to safety.

The Miami-Dade Police Department has an ongoing investigation into the missing cruise passenger.

Police are urging anyone with information about the cruise passenger who disappeared to contact Detective M. Ritch Jr. at 305-715-3300 or Miami-Dade Crime Stoppers at 305-471-8477.

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