police telling us 34-year-old song killed her two-year-old son , joseph wang, and took her own life. both died from asphyxiation. >> i would see her out and about spending a majority of time with her kids. that a shocking. reporter: several neighbors tell us the house is empty in the family only lived in it for about six months. police say the mother in son were living in -- >> we don't want that to ruin us, but we cannot predict it. reporter: unpredictable for a family who seemed to fit into a neighborhood for a short time. >> nothing shady at all. it was the opposite of that. >> the motive is under investigation. cheryl conner, abc 7 news. now, to a double murder suicide under investigation, this time in spotsylvania county. neighbors calling police after seeing the door of a home on waterford drive left wide-open and the dog grooming the neighborhood. when officers showed up, they found a mother, father, and their adult daughter all dead. a holiday weekend marked by violence. ec the chapters investigating four shootings. th 58th streetft -- on southeast. . 17-year-old was hurt thi

. >> reporter: investigators found joseph wang and his mother with injuries.ned the mother suffocated her son and committed suicide. had you ever noticed anything shady going on down here? >> no, no. >> seemed old, bro, like he was definitely just a very joyful little boy. >> reporter: you can see this lockbox on the front door. people who live in the area say the family moved out weeks ago. officers told wusa9 the family lived in glen burnie. were you scared? >> of course. i have two kids and my wife in the house. >> reporter: there are still unanswered questions police are working to get to the bottom of like what would drive a mother to kill her own son? >> you can't be a human being and not be sad to hear that. you see a 2-year-old and a mom, whatever the situation is. it's very sad. it's unfortunate. >> reporter: reporting in prince george's county, michael quander, wusa9. >>> it was a violent weekend in d.c. there were civil shootings and stabbings -- several shootings and stabbings the past two days. on saturday three stabbings were reported and one of

police found the bodies of you song and joseph wang this weekend. the family moved out of a house in glen burnie and police are still trying to find out a motive. >>> take a look at the repairs on the red line means fewer trains and fewer places to board. >> it's incredible. trains are not running between silver spring and fort totten weeks. >> adam tuss is at the silver spring station. looking at those lines and knowing it will be that way for two weeks, pretty tough for commuters. >> reporter: 100%. the sign out here lets you know what you need to know. no rail service between silver spring and the fort totten. >> a sleeping 2-month-old baby is a beautiful thing. >> especially when the baby sleeps through this. >> this is what the line to catch a shuttle bus outside the silver spring station looked like during the morning rush. >> think it's a nightmare. >> the baby belongs to melissa lubman. she's trying to get to woodman from silver spring and was caught off guard by the closure and she has another bus and two more trains to catch. >> i didn't k