( CNN ) -- A mother in Tampa , Florida has admitted in detail to killing her two teen-aged children , police said . Police checking on the family at the request of a relative found Julie K. Schenecker , 50 , on the back porch of her home Friday morning , dressed in blood-covered clothing , according to a police statement . They found her son , Beau Powers Schenecker , 13 , dead in the family 's SUV , which had been parked in the garage , the statement said . Calyx Powers Schenecker , 16 , was in an upstairs bedroom , also dead . `` She did tell us that they talked back , that they were mouthy , '' Tampa police spokeswoman Laura McElroy told CNN affiliate WTSP . `` But I do n't think that will ever serve as an explanation to the rest of us of how you could take a child 's life . '' The woman shot her son as she drove him to soccer practice and returned home to shoot her daughter as she studied on her computer , CNN affiliate WFTS reported , citing investigators . The preliminary investigation indicates that the teens were killed on Thursday evening , a police statement said , but a medical county examiner will determine the time of death . Police have charged the mother in the killings , the police statement said . Police were called to the house after Schenecker 's mother called from Texas to express concern about her daughter 's welfare , saying she was depressed , the police statement said . Schenecker was initially booked into jail , but was transferred to Tampa General Hospital for treatment of an existing medical condition , according to the Hillsborough County Sheriff 's Office , WTSP reported . Hundreds of people attended a candlelight vigil on Friday night in memory of the siblings , according to WTSP . `` It 's just sad that his mom did this to him and his sister because he did n't deserve this , '' one of the mourners , Hailey Johnson , told WTSP . `` He was the sweetest kid ever . '' `` I came out here tonight because I just needed to show respect and show that I really did care about Beau , '' said another mourner , teenager Ann Sloan .
A Tampa , Florida , mother is accused of killing her two children . She was charged with murder and child endangerment after she left the kids in a hot car for an hour while she went to work at a local hospital.