Police: Boy's Likely Killer 'Cold, Soulless Murderer' Similar burned fibers found on Jonathan Foster's body and in Mona Nelson's home By Mark Russell, Newser Staff Posted Dec 31, 2010 5:28 AM CST 5 comments Comments The police photo of Mona Yvette Nelson. (Houston Police Department) (Newser) – The woman accused of kidnapping 12-year-old Jonathan Foster, killing him, burning the body, and dumping it on Christmas Eve is a "cold, soulless murderer," according to Houston police. Investigators found a "wealth of evidence" at Mona Nelson's house: burned carpet and twine similar to that found with Foster's body, welding torches, and suspect items in her trash can, reports KHOU. "There are few cases that impact homicide detectives in this manner, but this is one of them," said an HPD detective. Investigators, who haven't yet released a possible motive, also speculate that Nelson may be a serial killer, and are investigating her possible connection to the deaths of other children. Nelson has admitted to dumping the boy's body in a ditch, but denies killing him. "I'm not a monster. I have five grandkids and I love kids," Nelson told the local ABC affiliate. Click for more on how Nelson knew Foster.