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By Tracy Connor and Miguel Almaguer

Phoenix police released a new sketch Thursday of a gunman who has been ambushing people near their homes and cars, killing seven since March.

A $30,000 reward has been offered for information leading to the suspect who has been stalking the streets of the Maryvale neighborhood — leaving bodies in his wake and victims' families pleading for the public's help.

"If you got kids and you love your kids the way we love the police find these people, bring them to justice," Dossie Ellis, whose daughter and granddaughter were killed in the last shooting, told NBC News.

Police released this sketch of a suspect in a series of killings in Phoenix.Phoenix Police Department

In each case, the killer has struck after dark. Men, women and children ranging in age from 12 to 55 have been murdered in their driveways or on the street with no apparent motive.

Police initially linked four shootings to the same culprit, but then confirmed this week that there were four more incidents tied to the pattern.

The connected shootings include:

  • A 16-year-old boy wounded while walking in the street at 11:30 p.m. on March 17
  • A 21-year-old male shot standing near his car on the street at 11:30 p.m. on March 18
  • Diego Verdugo-Sanchez, 21, killed April 1 while visiting his pregnant fiancée's family
  • Krystal Annette White, 55, found dead of a gunshot on April 19
  • Horacio Pena, 32, fatally shot June 3 after returning home from his job at a group home
  • Manuel Castro Garcia, 19, murdered outside his home on June 10
  • Stefanie Ellis, 33, her 12-year-old daughter Maleah and friend Angela Linner, 31, killed outside their home on June 12
  • An unoccupied car shot up at 2:35 a.m. on June 12.

Dossie Ellis said his loved ones never had a chance.

"Fourteen bullets in one. Twelve bullets in the other. Eight bullets in the other one," he said. "Shot 'em up like they enjoyed it."

Police said they have received information about the man's vehicle but descriptions have varied and so they are not ready to release those details.