the suspect, 27-year-old jason thomas scott, a college graduate, studying for a master's degree. maryland police say he is also a killer, whose victims include two pairs of mothers and daughters. scott, they say, studied police forensics, to learn how to hide his crimes using bleach and arson to destroy evidence and the database from his job at ups to identify potential targets. pierre thomas has the story on a cerebral serial killer suspect. >> reporter: the horror began at this home on january 26th, 2009 as an intruder neutralized the alarm system and slipped in. karen lofton, a 45-year-old nurse, was fatally shot as she tried to hide in this corner. her 16-year-old daughter was repeatedly shot as she frantically dialed 911 from her bed. police were perplexed. the doors were locked. no signs of forced entry. neighbors were terrified. >> so when they catch them, i'll be afraid. >> reporter: two months later, the bodies of delores dewitt, 42, and her 20-year-old daughter ebony were found in a burning car less than a mile away from the loftons' home. another nurse and a daughter k

worker jason thomas scott is linked to at least one other mother-daughter killing.rea. now investigators suspect scott is responsible for other unsolved crimes elsewhere. >>> investigators have doubled the reward in the case of kyron horman. oregon police are now offering $50,000 for information leading to the whereabouts of the 7-year-old. he's been missing since june 4th. a grand jury is hearing testimony in the case. kyron's mother also made a plea for his safe return. >> we love you, kyron. never give up hope. we are all coming to get you, to bring you home. >> we believe that kyron's disappearance involves criminal behavior, because his parents have been deprived of their son for 53 days. >> the investigation has centered around kyron's stepmother, terri horman. a close friend of hers has been called to testify before that grand jury. >>> a fast-moving brush fire is burning out of control this morning. it is spreading across a remote area of the mojave desert 70 miles north of l.a. flames have charred hundreds of acres. as many as 40 homes have been destroyed.

. >> reporter: jason thomas scott is a bright young college grad pursuing a masters in computer science. maryland authorities say he is also a stone cold killer. >> today a prince george's county grand jury returned a seven-count indictment against jason scott. >> reporter: scott was charged with murdering delores dewitt, a nurse, and her 20-year-old daughter ebony in march of 2009. >> she was a beautiful person, had a beautiful spirit. >> reporter: their charred bodies were found in a stolen car that had been set on fire. just months earlier, less than a mile away from the dewitt murders, police believe scott disarmed the security system at this home and then shot another nurse, karen lofton, as she hid in a corner. her 16-year-old daughter was repeatedly shot as she tried to dial 911. authorities believe scott, a ups employee, used his access working in a package sorting facility to find his victims' addresses. >> his employment is a core piece of this investigation. it's going to be very critical in laying out how the victims and everyone was actually identified. >> reporter: it's un

police say they believe 27-year-old jason thomas scott was methodically killing these women.smith is the mother of delores dewitt. >> to do this without knowing a person and you can be so evil knowing a person, not knowing a person and you want to do this. that's sad to be so evil. >> reporter: scott hardly looks like a monster. he's a college graduate, who police say was working towards a masters degree. he had a job at u.p.s. but when authorities searched his computer, law enforcement sources say they found evidence he had been studying police forensic tactics hunting for ways toout outwit authorities. allegedly using bleach to clean up his crime scenes, arson to destroy evidence and changing positions of bodies to confuse police. sources claim he also studied other serial killers and may have used u.p.s. databases to target victims. police believe scott led a double life, student and u.p.s. worker by day, but secretly involved in an escalating crime rampage ranging from burglary to home invasion, assault and, they claim, murder. they say that scott was selling stolen guns

. >> reporter: jason thomas scott they say is a serial killer with the blood of at least five women onformer ups worker was indicted in the murders of two of those women. >> we'll be seeking life without parole. >> scott allegedly murdered 42-year-old dolores de witt and her daughter ebony. in march 2009 their bodies was found in a stolen car after it was set on fire. scott is also the prime suspect in three others prince george's county, maryland mothers, including carolyn and her daughter melissa found shot to death in their home. in 2008, they will make butler was alone when she was gunned down before her home was set on fire. criminal profiler pat brown said if connected the pattern of the killing would fit the definition of a serial killer. >> this man was a ups driver. he did know the routes, the neighborhood and was able to case where he was going to attack. in my opinion these weren't accidental crimes. >> reporter: scott has been behind bars for the last several years on gun charges. he would face two life terms if convicted on the two counts of first degree murder. whit johns