After beating his 22-year-old girlfriend at a home in Coconut Creek, detectives said Sanjay Johnson called 911.
Coconut Creek Police Department Sgt. Scott Slavin said Johnson, 23, told police officers Tiffonia Dejeane Davids wasn't feeling well, passed out and hit her head on Friday.
Paramedics took Davids to Northwest Medical Center, where a doctor pronounced her dead at 2:49 a.m. Nurses learned that she had suffered multiple injuries from blunt force trauma.
After gathering evidence at the home at 4105 West Atlantic Boulevard, detectives determined Johnson used a baseball bat to beat her to death.
Records show Davids was a licensed practical nurse from Coral Springs who last worked at Integrity Health Services in Pompano Beach.
Police officers arrested Johnson and he was at the Broward County Jail on Saturday morning.