Matthew described his brother as a "loving and caring guy" who had been daring even as a child.
"He died doing what he loved," Matthew said. "He loved being adventurous and he loved being outdoors. That's was the kind of guy he was."
Matthew also said his brother had experience rock climbing and had recently swung from Corona Arch, where another man died in March.
According to sheriff's officials, the swing that killed Weber hangs from a metal airline cable spanning the canyon's walls, which are about 600 feet apart. Weber and Shiner completed the swing, but as he stepped out of the harness, he slipped and fell.
Rescue crews landed a helicopter above the canyon floor and rappelled down, but were unable to stabilize Weber before he died.
Matthew said Weber lived in West Valley City with his parents and had been preparing to get an apartment with Shiner. He worked for a company that built and repaired building foundations.
The Grand County Sheriff reported that several people had successfully completed the swing and had rappelled down before the accident. The sheriff's office has already investigated three fatalities this year involving rappelling or rope swings.
Initial reports indicate that the area where Weber died is part of the State of Utah School and Institutional Trust Lands, according to resource specialist Bryan Torgerson, of the trust. The land is administered by state officials, Torgerson said, and is set aside to benefit schools.
According to Torgerson, state land is open to the public and there are no restrictions regarding rappelling or rope swinging.
Torgerson added that investigators were still at the scene of the accident Monday afternoon.
Funeral arrangements had not been finalized Monday afternoon, but Matthew said the family was considering holding services Saturday.