The Jefferson Parish Sheriff's Office investigates the scene in Metarie Tuesday, June 18, 2019 after two men were shot to death inside a Cadillac Escalade near the intersection of West Metairie Avenue and North Upland Street. Police say 22-year-old Sean Barrette shot the two to death after apparently choosing them at random on Tuesday.  (Michael DeMocker/The Times-Picayune via AP)

NEW ORLEANS (AP) — A 22-year-old man has been arrested in connection with three apparently random shooting deaths in a New Orleans suburb, and ballistics evidence connects him to a fourth death inside the city limits, a Louisiana sheriff said Wednesday.

Sean Barrette of Metairie was arrested late Tuesday and faces charges including second-degree murder in connection with a shooting death late Monday at a Metairie intersection, and two counts of first-degree murder in two fatal shootings Tuesday afternoon near another Metairie intersection. He is also linked by ballistic evidence to a June 6 shooting death in eastern New Orleans and another shooting on June 5 in New Orleans in which nobody was injured, Lopinto said.

"We've not been able to identify any connection between the victims and the suspect," Lopinto said at a news conference. "I believe that he was actually picking his targets at random, shooting them in the vehicle."

A cellphone found at the scene of Monday's shooting was eventually traced to Barrette, said Lopinto. He added that Barrette has had "a history of mental problems," including two commitments for treatment, in December and April.

The victim in Monday's shooting was identified as Isai Cadalzo, 22. Killed Tuesday were Manuel Caronia 45, and Nicky Roseau, 57.

Lopinto had little information about the New Orleans slaying, but New Orleans media report the only shooting death reported June 6 was that of 61-year-old Bruce Reed, found fatally wounded in a grassy area next to a major eastern New Orleans street.

Barrette was arrested without incident at his parents' home. The weapon believed used in the killings has been recovered, Lopinto said.

Lopinto was asked whether race was considered a factor in any of the deaths. Barrette is white. In Jefferson, two of the victims were Hispanic and one was white. The New Orleans victim was black.

There has been no evidence so far to indicate race might have been a motive, Lopinto said. "That could change, obviously, when we continue our investigation," he said, adding that the probe would include scrutiny of Barrette's web searches.

Sean Barrette of Metairie, La., is seen in an undated photo provided by the Jefferson Parish Sheriff’s Office. Jefferson Parish Sheriff Joseph Lopinto announced the arrest of Sean Barrette of Metairie on Wednesday, June 19, 2019, on multiple homicide counts related to two separate shootings on West Metairie Avenue in connection with three shooting deaths in a New Orleans suburb.  (Jefferson Parish Sheriff’s Office via AP)
People react Tuesday, June 18, 2019 at the crime scene tape after two men were shot to death inside a Cadillac Escalade near the intersection of West Metairie Avenue and North Upland Street in Metarie, La. Police say 22-year-old Sean Barrette shot the two to death after apparently choosing them at random on Tuesday. (Michael DeMocker/The Times-Picayune via AP)
Two women react to news of the deaths upon arriving at the scene after two men were shot to death Tuesday, June 18, 2019 in Metarie, La., inside a Cadillac Escalade near the intersection of West Metairie Avenue and North Upland Street. Jefferson Parish Sheriff Joseph Lopinto on Wednesday announced the arrest of Sean Barrette of Metairie. (Michael DeMocker/The Times-Picayune via AP)
The Jefferson Parish Sheriff's Office works a SWAT roll on Trefny Avenue in Metarie, La., Tuesday, June 18, 2019 as they capture 22-year-old Sean Barrette at his house not far from the scene where two men were shot to death inside a Cadillac Escalade. (Michael DeMocker/The Times-Picayune via AP)
The Jefferson Parish Sheriff's Office investigates the scene Tuesday, June 18, 2019 after two men were shot to death inside a Cadillac Escalade near the intersection of West Metairie Avenue and North Upland Street in Metairie, La. Police say 22-year-old Sean Barrette shot the two to death Tuesday after apparently choosing them at random. (Michael DeMocker/The Times-Picayune via AP)
Sean Barrette of Metairie, La., is seen in an undated photo provided by the Jefferson Parish Sheriff's Office. Jefferson Parish Sheriff Joseph Lopinto announced the arrest of Sean Barrette of Metairie on Wednesday, June 19, 2019, on multiple homicide counts related to two separate shootings on West Metairie Avenue in connection with three shooting deaths in a New Orleans suburb. (Jefferson Parish Sheriff's Office via AP)
CORRECTS LOCATION TO NEW ORLEANS, NOT METARIE - In a Thursday, June 6, 2019 photo, a crime scene technician places evidence cones in the grass on Marquis Street at Hayne Blvd. in New Orleans, as New Orleans police investigate the shooting of 61-year-old Bruce Reed, a murder police have linked to 22-year-old Sean Barrette, who they say chose four recent homicide victims at random. (Michael DeMocker/The Times-Picayune via AP)