A pregnant 16-year-old girl was fatally shot during a robbery early Friday morning at a Birmingham apartment complex.

Raven Terese White was transported to St. Vincent's Hospital East at around 12:30 a.m. and died about an hour later, Jefferson County Deputy Coroner Johnny Long said.

The deadly shooting occurred at Panorama East Apartments located in the 3000 block of Panorama East in Apple Valley, according to Birmingham police.

Lt. Sean Edwards said it's currently unclear why the gunman decided to fire his weapon.

"This case is our highest priority and we need the community's help in putting this cold blooded killer behind bars," Birmingham Police Chief A.C. Roper said.

Birmingham police's preliminary investigation revealed White and her 18-year-old boyfriend were sitting in their car eating pizza when an unknown black male approached them and demanded money.

White was shot during the robbery. Her boyfriend transported her to the hospital.

"We don't think there was a struggle," Edwards said, adding he couldn't say from which direction the bullet entered the vehicle.

"The boyfriend was extremely upset," he added.

Edwards said the boyfriend as well as witnesses from the apartment complex are cooperating with investigators.

White's friends and family are in shock after learning Raven was killed outside the apartment she shared with her mother and sister.

"I just can't believe it," said Angie Barber, a friend of Raven's mother, Tangee White.

She said Raven was six months pregnant and excited to become a mother.

Barber said she had let Raven babysit her newborn about three weeks ago so she could practice taking care of an infant. Raven also asked her a lot of questions.

She said Tangee White appears to be in disbelief.

"She really won't talk," Barber said, adding late Friday morning that Tangee wasn't ready to talk to detectives.

"Her first-born baby was pregnant, and she was just coping with her being pregnant," Barber said. "She was planning a baby shower, but now she has to plan a funeral."

Barber said Raven attended Clay-Chalkville High School in Pinson and worked at Wal-Mart.

"She was very outgoing," she said, of Raven. "I know she loved school. Even after getting pregnant, she made good grades and didn't miss a day of school."

Barber said Raven had gotten off work at Wal-Mart just hours before the shooting.

Birmingham police say the shooting suspect, who was a black male wearing a blue bandanna, got into a dark-colored vehicle and fled the scene.

Edwards said anyone who witnessed the crime or saw a dark-colored vehicle speed away from the area, should call police at 205-254-1777.

Investigators are reviewing crime reported over the last 12 hours to see if they are connected to the homicide.

Raven White's friends also took to Twitter to express their grief over the teenager's death.

Y'all didn't deserve this in any way Rip Girls 💯🙏🏾👼🏾 pic.twitter.com/rmoYQBhBX8 — YG♿️ (@yatilgant11) January 8, 2016

There is no need to say I have leave my city because it's so much violence. Violence is everywhere we just got to stay prayed up as a city🙏🏾 — Broadway Bliff✍🏾 (@OFGBliff) January 8, 2016

Updated at 12:34 p.m. with comments about homicide victim. Updated at 11:19 a.m. with the homicide victim's name.