HARRIS COUNTY, Texas -

One of two brothers already facing charges in connection with a deadly birthday party shooting at a Cypress-area home is now charged with murder.

Randy Stewart is charged in the death of Qu'eric Richardson, who was shot and killed at a home in the 7300 block of Enchanted Creek in November 2013.

Stewart, 18, has been in the Harris County Jail since his November arrest and charged with aggravated assault with a deadly weapon in connection with the shooting.

In February of this year, Stewart and his brother, Marvin, were also charged with tampering with evidence. Marvin Stewart is not in custody.

Richardson, 17, and Arielle Olivia Shepherd, also 17, were killed, and about 20 others injured, when suspects started firing guns during a house party that had been advertised as a birthday celebration on Twitter and other social media networks.

Investigators are still actively looking into the death of Shepherd.

According to the Harris County Sheriff's Office, the gun in the tampering case has not been found despite an extensive search.

Anyone with information is urged to call Crime Stoppers at 713-222-TIPS or submit a tip via the iWatchHarrisCounty app.