as nbc's chris polon shows us, prosecutors say the victims were killed during a drug deal. >> reporter: a day after 20-year-old cosmo d and telling investigators where their bodies are, prosecutors in bucks county, pennsylvania, have now charged him and another man with murder and conspiracy. >> i'm very, very relieved to say that we brought four young men one step closer to their loved ones so they can rest in peace. >> police arrested sean kratz hours after dinardo's confession that deal, dinardo's attorney claims, was to keep his client from facing the death penalty. >> cosmo was spared life in terms of giving all of his relevant information he possibly could. >> district attorney matt weintraub said three of the victims were buried together in a grave more than 12 feet deep. the fourth was buried at least a quarter mile away. >> we'd still be looking for jimi patrick had we not made this agreement. >> dinardo is now charged with four murders, kratz with three. the disappearance of the four men triggered a massive search. investigators quickly focused on an estate owned by dinardo's

chris polon, nbc news, new york. >>> you may be waking up in the richest county in the country. it may not feel like it. the census county loudoun county takes the top spot. median household income is $125,000, home value almost half a million. home, schools and department of homeland security. falls church, fairfax, prince william and arlington counties, montgomery, calvert and howard counties in maryland. we have posted the entire list >>> talking more trouble for metro. what a new review is uncovering about employees and overtime abuse and the action the agency is now taking. >>> a sign of freedom and a community coming together. how neighbors are showing their pride after flags were found d.rn and burne >>> disturbing and disappointing, how he feels after a review found an employee abused overtime. the metro employee was a track supervisor now let go. they found the supervisor was getting paid significant overtime earnings including for times that employee was not working. other employees are also under review for similar practices. metro's union says on twitter that it's no

nbc's chris polon reports, patients and doctors did whatever they could to try and survi survi survive. >> reporter: a suspect reported with long gun. >> police in new york city trying to find everything they can about the shooter, henry belo, a doctor that worked at the bronx hospital six months before quitting two years ago. >> they have a confirmed active shooter. shots fired at the location. >> just before three belo pulled ar-15 rifle out of his coat and opened fire on 16th floor. panicked patients and staff struggled to get out or high. >> happened in orlando, killed in the bathroom. >> belo killed a doctor and tried to start a fire near nurses' station. six others treated for injuries. police found him dead of a self-inflicted gunshot. >> thank god this was not an act of terrorism. it was an isolated incident. it appears to be a workplace related matter. that makes it no less tragic or horrible. >> a tragedy where people go to heal. questions remain why and could anything have been done to prevent it. >>> bring you back to the district. d.c. police need your help finding hit-and