the donor's family asked to romaine anonmust at this time -- anonmust at this time. >>> today is nationaltes day. they want to us look out for risk factors. it can lead to seerous complications but you have to note risk factors and determine if you're prone to developing the disease. >>> does your child play sports? there's a troubling trend when it comes to sports injuries. more people are injuring their achilles tendon. >> reporter: staying active is an important part of mat williams life. part of his job is to develop field turf used in sports stadiums many he injured his achilles tendon. >> it was pain, stiffness, inability. it's taken probably a solid two months to being committed to the therapy and the programs that the doctors and therapists have given me. >> reporter: it severely limits him and cost him time off work. it's an injury that doesn't discriminate. >> these injuries occur in everything from young kids playing sports to weekend warriors. >> reporter: he is the director of research at the sports medicine department. it shows akeel lease injuries -- achilles injuries have

song posted his intentions on two websites where you can remain anonmust. detectives were able to trace the ip address and that led them to his dorm room. song was arrested sunday morning and is currently undergoing a psychiatric evaluation. he intended to go on shooting rampage at 1:30 today at the university of maryland mall. it left many students unsettled. >> i don't think anything is going to happen today, but obviously, somebody felt driven to kill people on campus, at my school and that's very sad. >> police said they recovered his laptop but no weapons. brian kuebler will have much more on the investigation and why police believe song planned the attack. that's coming up at 6:00. >>> demand -- a man is in police custody accused of stabbing his girlfriend's son to death. police said officers were called to pyxwood drive around 10:00 after the 28-year-old man took himself to northwest hospital where he died a short time later. so far, no charges have been filed. >>> the judge overseeing former penn state assistant coach jerry sandusky heard arguments