A 27-year-old exconvict was charged with first-degree murder yesterday in a warrant obtained by district police in connection with the killings last months of three persons is a house in Southeast Washington.

Police identified the suspect as Melvin Jones and said they did not know his address. They said they obtained the warrant after taking fingerprints and making a search of the house at 3028 P St. SE where the slayings occurred Sept. 28.

The victims were identified as John Covington 63, his wife, Virdell, 60, and Mrs. Civington's sister, Carolyn Bruton, 64.

Police said Covington was known to be involved in te illegal numbers game and said they believed robbery was the motive for the killings.

Police said Covington was believed to have kept large sums of money in the modest brick house, but said they did not know if any was taken.

Police said they believe two person were involved in a slayings, but they have not identified a second suspect.

According to police Jones has been convicted of robbery and of carrying a dangerous weapon. They said they have been unable to locate him and asked the public for help. They cautioned that he is believed to to armed.