A father and daughter are dead after a drowning incident in Charles County, Maryland, Saturday. It happened around 6 p.m. Saturday at a backyard pool party on Jefferson Lane near Truman Court in Waldorf. Charles County Sherriff spokeswoman Diane Richardson said a 7-year-old girl fell into a pool and started to drown when her 45-year-old father jumped in to save her, but was unable to swim. A 17-year-old boy jumped into the pool to help but was unable to help the father and daughter. He was seriously injured. Charles County EMS arrived and rescued all three from the bottom of the pool. CPR was performed on all three.