marcel titus murder remains a mystery, deepening and already his killer remains at large.just feet away from peace way, all we know is an argument between marcel and anotherthe suspect ed gun, shooting the 20-year-old before taking off. now 28, his father has spent every second wishing for more time. >> that is the part, that part, as they say. you know? i could never imagine him not being here, talking. >> what would you tell him now? >> i love you. >> metro is still looking for the gunman. anyone with information is asked out to crimestoppers. we will have the e-mail and phone number on our website. news3lv.com. the attorney representing the family of a man shot and killed this month is releasing video of the incident. we want to warn you it shows some very tense moments as>> drop it. drop it. this video does not capture what led up to the shooting, but san francisco police said he was armed with a kitchen knife. there was a stabbing earlier that day. he was killed in a shooting. now, his family is planning a federal civil rights lawsuit. the police chief is defending his officers use

the murder of marcel titus remains a mystery. the man was gunned down a quiet southwest neighborhood. we spoke exclusively with the family. reporter: his unsolved murder is deepening and already painful wound for his father was wishing for more time. still searching for the why. 26 days ended gordon titus has felt every second. >> thinking about him. i don't know. it's like, man, and part of me is gone. reporter: his son was found on bonita vista street. all the know is an argument between marcel and another man escalated. the suspect pulling out a gun and shooting the 20-year-old >> you never want to hurt reporter: he was imprisoned for three years. now trying to patch things up with his son, thinking you would have more time. >> that is the part, that part as they say. i never could imagine him not being here. reporter: 26 days marks the worst moment in gordon's alive. now shaping his future. >> i think of him, and i think i can't do nothing crazy. what did you do this for? reporter: what would you tell him now? >> i love you.