At least 24 people were shot, including four fatally, in separate shootings across Chicago over the past weekend, police said. On Saturday, a man, who was later identified as 26-year-old Siraj Mahadeva, was shot and killed while standing on the porch of a friend’s house on the Northwest Side, officials told the Chicago Sun-Times. The man was found by his friend after the friend heard a loud sound at around 3:25 a.m., said authorities. Mahadeva was taken to Mount Sinai Hospital and was pronounced dead, officials said. A man was also fatally shot on Saturday afternoon in the West Pullman area on the Far South Side, authorities told news outlets. Ralph Williams, 38, was sitting in a vehicle near West 119th Street when two individuals approached the car before one opened fire at around 12:10 p.m., officials said. Williams was hit in the back and taken to Christ Medical Center in Oak Lawn. …