CHICAGO (WBBM NEWSRADIO) --  Nearly one month after Chicago Police say a Green Party activist was shot and killed while confronting a hit-and-run driver in the Greater Grand Crossing neighborhood, community activists and family members are pressing for answers.

No arrests have been made since police say 39-year-old Alberto Bocanegra was fatally shot near 76th and Eberhart after seeing a car hit a bicyclist and drive away.

Sergio Angel Bocanegra said his brother was battling blood and bone cancer, and will be remembered as a hero.

"He always fought the good fight," Bocanegra told reporters Sunday on the South Side. "He died for it. He was always looking out for the neighbors, he was always looking out for whoever needed help. He stood for injustice."

Donations from Bocanegra and Community Activist Raul Montes Jr. have increased the reward for information leading to an arrest to $10,000.

"Somebody knows something," Bocanegra said. "Please come forward. Give us closure."