What to Know Both armed robbery suspects are in custody and face preliminary charges of capital murder and aggravated assault with a deadly weapon.

Two victims, a man and a woman, remain hospitalized in an unknown condition following the shooting and robbery.

The names of the good Samaritan, two victims and two robbers have not yet been released.

Two people are facing capital murder and aggravated assault charges after a robbery and fatal shooting inside a San Antonio shopping mall Sunday ended with one man dead and three others injured, including one of the robbers, police say.

Leslie Garza, the director of communications for the San Antonio mayor, told NBC News the robbery took place at about 3:30 p.m. Sunday at a Kay Jewelers inside the Rolling Oaks Mall on the northeast side of the city.

As two armed robbers ran the store, one of them fatally shot a "good Samaritan" who got in their way and tried to stop them, according to San Antonio Chief of Police William McManus.

Police have not said what the good Samaritan, identified Monday as 42-year-old Jonathan Murphy, tried to do to stop the men.

McManus said a witness to the shooting, who was carrying a licensed concealed weapon, shot and wounded the armed robber who killed Murphy.

San Antonio police spokesman Officer Doug Greene said Monday the man who shot one of the armed robbers was within his rights to use his gun.

"What we have here is a robbery gone really, really bad," McManus said, adding that the fatal shooting was "absolutely senseless."

The second robber ran from the mall, firing his weapon and injuring a man and a woman.

A witness who spoke to WOAI-TV said she heard as many as six gunshots.

San Antonio police and Bexar County Sheriff's Deputies arrived and the mall was locked down while a store-by-store sweep was conducted to search for the second gunman and anyone else who may have been involved.

Meanwhile, the injured man, woman and robber were all taken to area hospitals, according to San Antonio Fire Chief Charles Hood. Two other people not injured by gunfire — a woman who complained of chest pains and a pregnant woman who had labor pains — were also taken to local hospitals.

San Antonio Mayor Ivy Taylor and San Antonio police both tweeted Sunday night that the second robbery suspect had been arrested, though no other details about the arrest were immediately available.

"Today's deadly shooting at Rolling Oaks Mall is a tragedy for everyone involved and all of us affected," Taylor said in a statement posted on Facebook.

The investigation into the shooting is ongoing and police have not yet released the names of the suspected robbers or the victims injured and killed in the shooting.

Authorities said both suspects face preliminary charges of capital murder and aggravated assault with a deadly weapon.