Miami Beach, Fla. ? A doctor killed his two young children Saturday by throwing them off the 15th floor of a landmark South Beach hotel and then jumped to his own death, police said.

Dr. Edward Van Dyk, 43, tossed his two sons, ages 4 and 8, to their deaths around 8:20 a.m., Miami Beach Police spokesman Bobby Hernandez said. Authorities did not release the names of the two boys.

The mother of the children, Qinuo Van Dyk, 40, told police she and her husband had been having marital problems for the past six months, but hadn’t argued right before the incident, Hernandez said.

The woman heard one of her children screaming from an adjacent room in the Loews Hotel, where the Alton, Ill., family was staying. When she walked into the room she saw her husband going off the balcony, Hernandez said.