CHICAGO (WLS) -- A pregnant woman was found shot to death in Chicago's South Shore neighborhood Thursday afternoon, according to police.Police said 26-year-old Patrice Calvin was pronounced dead on the scene at an apartment on the 7500-block of South Luella around noon.Police said she was four months pregnant and was shot in the head.Police said Calvin lived on the third floor of an apartment building at 75th and South Luella.Officers were called to the apartment building on Wednesday around 9 p.m. after gunshots were reported."Police got the call. Neighbors called them. They came and knocked on the door. Why didn't you open the door? My daughter could have been in there bleeding. She could have still been alive," Aaron Calvin, the victim's father, said.Calvin's family gathered at the scene on Friday, waiting for answers."Why is there too many guns in Chicago? That's what we want to know. And why is innocent people being killed for no reason?" Sid Taylor, victim's cousin, said.Calvin's father said he spoke with his daughter two days ago. He said his son went in on Thursday to check on her and found her dead. Police don't have anyone in custody.The family said they don't know why someone would do this."She had a beautiful smile, very independent, she loved her family, she was looking forward to having her first child," Aaron Calvin said. "My daughter was carrying my grandchild. That is two people dead," Aaron Calvin said.Area South detectives are investigating.No one is in custody.