As Atlanta police search for the suspected gunman, 24-year-old Deion Patterson, they say a car was stolen "not long after the shooting" and has since been recovered.

"We are working to locate the carjacked vehicle and to determine whether it is connected to the shooting," police said.

Dr. Ahmed Ali, a radiation oncologist at the building, told ABC Atlanta affiliate WSB that he was returning from his lunch break when he saw armed officers swam the scene.

"I was worried what was happening," he said. "Building security … they told me gunshots were coming from the 11th floor. They said there was a pool of blood in the elevator shafts when the doors opened."

-ABC News' Ivan Pereira

Of the four people who were shot and injured, three are in critical condition and one is in the emergency department, according to hospital officials.

All four are adults, officials said.

One person was killed and four were injured in the shooting at Laureate Medical Center in Atlanta, according to police.

"Officers are actively searching for the suspect and any other victims," police said.

Northside Hospital tweeted that it's "cooperating with law enforcement following the shooting at our midtown #Atlanta location earlier this afternoon. We urge people in the area to shelter in place and follow instructions from law enforcement on the scene."

The family of 39-year-old Amy St. Pierre is speaking out about their profound loss.

"Our beloved Amy was brilliant, kind, big-hearted and simply the 'best of the best,'" her family said in a statement. "Loving wife and mother of two, middle sister to two brothers, and cherished daughter, she was truly our pride and joy."

St. Pierre worked at the Centers for Disease Control and Prevention's Division of Reproductive Health, according to CDC Director Dr. Rochelle Walensky.

"An Emory honors graduate and Georgia State MBA, Amy traveled the world with curiosity and courage," her family said. "She was driven by compassion, both in her work in the field of maternal mortality, and in her everyday life. Amy was selfless always, she wanted more for others but never for herself. Generous supporter of worthy causes, she was the social conscience of our family."