JUPITER, Fla. -- A Florida man suspected of killing four family members in a Thanksgiving shooting was arrested Saturday in the Florida Keys after an intense nationwide manhunt.

Jupiter Police Sgt. Scott Pascarella said Paul Merhige was taken into custody by U.S. Marshals and Monroe County Sheriff's deputies late Saturday at a motel in Long Key. Pascarella said officers took Merhige into custody without a struggle.

In court Sunday morning, Merhige was noticeably thinner and had shaved his head. It was an image much different from those on surveillance cameras of Merhige purchasing a gun and withdrawing more than $10,000 in cash days before the mass murders.

Merhige is now behind bars at the Palm Beach County Jail being held on no bond.

The U.S. Marshals Service said the tip led police to the Edgewater Lodge Motel at mile marker 66.5 on the Overseas Highway.

Investigators said the tipster also described Merhige's vehicle, a 2007 blue Toyota Camry that police had asked the public to look out for.

When they spoke to the managers of the hotel, the U.S. Marshals Service said investigators learned Merhige had been there since Dec. 2, paying in cash at least two weeks in advance. Investigators said Merhige had tried to hide his car in the hotel's parking lot with a car cover and the license plate was previously registered to a Lexus Merhige's father owned in 2006.

Investigators said Merhige had been hiding at the oceanfront motel for more than a month – paying in cash weeks in advance, registered under the name John Baca.

The hotel's owners recognized Merhige in a promotional spot for "America's Most Wanted."

"The first thing the news flashed was his face on the screen and I said, 'I know that guy. That guy is staying here," said hotel owner Paul Pfaff.

The Pfaffs called 911 at about 7 p.m. Saturday, and in less than 30 minutes, U.S. marshals, Monroe County sheriff's deputies and Miami-Dade police had the hotel surrounded. By 10 p.m., the police broke the window to Merhige's room, stunned him with a Taser and took him into custody without a fight.

Merhige looked different; he had grown a beard, shaved his head and lost weight.

In his room – filled with piles of clothing and dirty utensils – agents also found hair coloring, latex gloves and helium canisters.

"I thought it was a little weird because he never came out of his room," Pfaff said.

The 35-year-old Merhige had been the subject of a massive manhunt that included a $100,000 reward for information leading to his capture. Pascarella credited coverage of the case on America's Most Wanted with helping lead to the apprehension.

Merhige is accused of killing his twin sisters, aunt and 6-year-old cousin on Thanksgiving Day at a gathering in Jupiter.

Investigators said Merhige planned carefully, taking clothing, cash and a computer hard drive before the killings.

There was no indication Saturday that Merhige had an attorney. He remained silent as he stood before a judge in Palm Beach County.

"This does not bring my daughter back, so I'm not jumping up and down with jubilation. But at least now I'll be able to sleep knowing the monster's not right outside my door, hoping to finish what he started on Thanksgiving," said Jim Sitton, whose 6-year-old daughter was among those killed in the shootings.

Merhige faces four counts of first-degree murder and two counts of attempted first-degree murder in the shootings, which also injured two other people.

Merhige is being held in isolation in the mental health unit at the Palm Beach County Jail. His next court appearance is on Feb 1.