At least 36 people were shot and four were killed in Chicago this past weekend.
Rhymer, 33, gunned down in the city's Englewood area.
Taniyah Thomas of Washington, Pa., was killed on March 31 after being shot in the head during an attempted home invasion.
"We're heartbroken that something like this might have happened again," the president said.
A new report from the Violence Policy Center shows that Black women are killed at a disproportionate rate, mostly by guns at the hands of Black intimate partners.
A member of the ATL group was reportedly shot in the leg on the way back from Miami nightclub.