LOS ANGELES (CBS) — Hundreds of billboards are expected to go up across the Southland Thursday to help find the men who brutally attacked Bryan Stow at Dodger Stadium.

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The San Francisco Giants fan has been in a medically induced coma since the assault in stadium parking lot on March 31.

An outdoor advertising company is donating the billboards, which will include sketches and information about the men who allegedly attacked Giants fan Bryan Stow, as well information about a $100,000 reward.

Erin Collins, Stow’s sister, told KNX 1070 she expects results from the campaign.

“We were told that it’s never been done before, so it just shows how much people believe that these guys need to get caught,” Collins said.

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Collins said Stow’s condition is “progressing” as he continues to recover from the brutal attack. He was apparently targeted for wearing Giants attire after the Opening Day game.

The billboards from Lamar Advertising Company include a phone number to call for anyone who has information about the suspects.

“I asked myself what I could do, and I figured we got some billboards, let’s put it out there for everybody to see again,” said Lamar advertising VP Ray Baker.

Baker says there will be 200 billboards posted Thursday, with an additional 100 going up Monday.

In the end, Collins said she just wants justice to be served.

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“The longer it’s been, the angrier we start to get,” Collins said. “They deserve to be punished for what they did to him.”