Maurice Roberts, 21, and his 16-year-old brother Marvin were arrested Saturday. Police say the teen fired the two shots that killed Grandzol.
Police say there are no other suspects involved in the incident, and their family is cooperating with police.
Both of the Roberts brothers are known to police and have been arrested previously.
A Gofundme page, the Gerard Grandzol Memorial Fund, which was started by friends on behalf of the Grandzol family, had raised $113,000 as of Sunday afternoon. "I believe they asked for the keys and then he was shot twice", Ryan said.
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Officials say the brothers approached Grandzol, who had just parked his auto with his 2-year-old daughter inside, around 8 p.m. on the 1500 block of Melon Street, where Grandzol lived. Those two gunshots just destroyed my life and my two daughters don't have a father now. He was also taken into custody Saturday. But for some unknown reason, the perpetrator fired two shots, ' Philadelphia Police Chief Inspector Scott Small said at a televised news conference.
Neighbors quickly rushed to Grandzol's side.
The father-of-two was a community activist in his neighborhood and served on its development board.
"'By the time we ran up to him, people were bandaging him, holding him... and right in the head, right in the face, there was a pool of blood", one resident told WPVI. "He engaged himself with everyone he met". 'And I'm going to miss him'. He was the executive director of a legal recruiting company. Everybody loved him and he was just the best. "He was the best husband, father, neighbor, friend that we could ever ask for", Wan said.
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Grandzol leaves behind a wife and two children.
"He was an unbelievable dude", said Scott Rudich, the co-founder of Lansdale, Pennsylvania-based Round Guys Brewing where Grandzol would occasionally tend bar.
His 21-year-old brother - who allegedly was with him when Gerard Grandzol was shot - had been placed on probation in May after pleading guilty to selling drugs in Center City, court records show.
"My heart is hurting for them, for their family".
National Weather Service warns Florida Keys: 'TIME TO HUNKER DOWN'
Heavy rainfall of 4 to 7 inches is forecast Monday across areas south and west of interstate 26, with 3 to 5 inches elsewhere. As long as we stay on the WEST side of the circulation, we will not see much really rough weather.