The hatchet-wielding hitchhiker became an Internet sensation in February.

Caleb McGillvary, also known as Kai, the hatchet-wielding hitchhiker of “Smash, smash, SUH-MASH!” fame, was arrested in Philadelphia on a New Jersey warrant in a slaying case, authorities said.

McGillvary, 24, was arrested without incident at a Greyhound Bus stop about 6:30 p.m. Thursday. Authorities in Union County, New Jersey, named the animated, couch-crashing drifter as a suspect in the death of New Jersey attorney Joseph Galfy.

Galfy was found dead Monday inside his home on Starlite Drive when officers made a welfare check, Union County prosecutors spokesman John Holl said.

An autopsy determined Galfy died of blunt force trauma.

McGillvary was recognized by a Starbucks employee when he stopped in for a drink, said Philadelphia police officer Christine O’Brien. After he left, the employee called police, who searched the area and found McGillvary at the bus station.

Officials did not say where McGillvary was headed.

A Union County District Attorney official declined to reveal how the hitchhiker was tied to the lawyer's killing. McGillvary is being held on $3-million bail and will be extradited to New Jersey in the coming days, prosecutors said.

“I am grateful for the overwhelming response and dedicated effort by the public and law enforcement that led to this arrest,” said Union County prosecutor Theodore J. Romankow in a statement. “I believe that everyone is a little safer with this person off the streets.”

McGillvary, also known as Kai Lawrence, Caleb Kai Lawrence and Kai Nicodemus, is well-known on Facebook and YouTube and has traveled the country relying on the generosity of others for lodging, food and transportation.

It was in Fresno that Kai's meteoric rise to fame via viral video began after he helped a woman who was being attacked. KMPH-TV news captured a memorable interview with Kai in a video that received more than a million hits.

“Smash, smash, SUH-MASH!” was McGillvary’s description of how he swung a blow for justice in Fresno to stop a large driver who allegedly ran over and attacked a PG&E employee.

Stephen Colbert aired the video on his Comedy Central show, adding in his trademark commentary that the young man's heroics had prompted him to rethink his previous prejudice against hitchhikers.

In a Facebook post that appears to belong to McGillvary, he said he was raped.

“What would you do if you woke up with a groggy head, metallic taste in your mouth, in a strangers house... walked to the mirror and seen [bodily fluid] dripping from the side of your face from your mouth, and started wretching, realizing that someone had drugged, raped you?” he wrote. “What would you do?”

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Joseph.serna@latimes.com

@josephserna