The following are stories and questions about them. Each story is followed by a question and answer to a given question.

Story: (CNN) -- A former Utah policeman is a suspect in at least three of Monday's four rush-hour shootings near Dallas, Texas, including one of two fatal attacks, police said Tuesday. 

CNN affiliate KSL in Salt Lake City, Utah, provided this file photo of the Dallas suspect, Brian Smith. 

The suspect, Brian Smith, tried to commit suicide after the Monday-evening shootings and was in a hospital in serious condition, Dallas police detective Lt. Craig Miller said. 

Police used ballistic tests to link Smith, a Utah state police officer for 12 years, to the shootings in which one driver was killed, one was injured by shattered glass and one escaped uninjured, Dallas police detective Lt. Craig Miller said. 

Miller said it is unclear if Smith was involved in the other fatal shooting, which was the first attack of the evening. 

Four motorists were attacked along a three-mile stretch near and on the LBJ Freeway, about 10 miles northeast of downtown Dallas, on Monday evening, police said. 

The first attack, which happened in Garland, Texas, about 5:41 p.m., killed Jorge Lopez. Garland police said Lopez, 20, was sitting in his Nissan at a traffic light when a man in a pickup pulled alongside him and fired shots into his car, killing him. A few minutes after the Garland shooting and two miles away on LBJ Freeway, a gunman fired at two tractor-trailers. 

While one driver escaped injuries, William Scott Miller, 42, of Frankfort, Kentucky, was shot to death behind the wheel of a United Van Lines truck, police said. 

Question: Who was killed driving in a United Van Lines truck?
Answer:William Scott Miller

Question: Where was near the site of four rush-hour shootings?
Answer:the LBJ Freeway

Question: In what state were they?
Answer:Texas

Question: Who was the suspect?
Answer:Brian Smith

Question: What was Smiths' profession?
Answer:policeman

Question: What did he try to do to himself?
Answer:commit suicide

Question: How many drivers were attacked on the LBJ?
Answer:Four

Question: When was that?
Answer:Monday

Question: What did police use to link Smith to the shootings?
Answer:ballistic tests

Question: Where was the first incident?
Answer:Garland, Texas

Question: Who died in it?
Answer:Jorge Lopez

Question: How old was he?
Answer:20

Question: What was he doing?
Answer:sitting  at a traffic light

Question: Where is the suspect now?
Answer:in a hospital

Question: How long had he been an officer?
Answer:12 years

Question: In which state?
Answer:Utah

Question: What happened several minutes after the Garland shooting?
Answer:
a gunman fired at two tractor-trailers