Man charged in hours-long standoff at Chicago federal building released from custody with monitor

Suspect entered Dirksen Federal Building armed with knife, federal officials say

ByABC7 Chicago Digital Team WLS logo
Tuesday, August 19, 2025
Federal building standoff suspect released from custody with monitor

CHICAGO (WLS) -- The man charged in a nine-hour-long standoff at the Dirksen Federal Courthouse last month has been granted his release from custody.

Prosecutors say Mario Santoyo, 38, of Chicago brought a knife into the building last month, prompting the standoff.

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In court Tuesday, a judge ruled that Santoyo will be released into the custody of his sister, with an ankle monitor.

READ MORE | Process of protection behind safe outcome of hours-long standoff at Dirksen Federal Building

He's also being ordered to stay away from any federal buildings, except for court appearances.

And he will receive psychiatric assistance.

Santoyo is charged with felony possession of a dangerous weapon in a federal facility with intent to use the weapon in the commission of a crime, officials said.

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