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MIAMI (CBSMiami) – Four years after Amanda Haworth and Roger Castillo were gunned down serving a warrant on a vicious killer, the two Miami Dade police detectives will be honored by the police department Tuesday.

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Haworth and Castillo were members of a special police squad that went looking for the worst of the worst criminals. On January 20, 2011, their target was Johnny Simms, a career criminal wanted for murder.

When the detectives knocked on the door of Simms’ mother, she let them in. But as soon as Haworth entered the house, Simms burst through a bedroom door and began firing – even though his own mother was in the line of fire. Simms shot Haworth in the head and then as he ran out the front door shot and killed Castillo. Simms was killed himself a few seconds later by another detective from the warrants squad, Oscar Plasencia.

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Haworth and Castillo’s death shook the community.

Tuesday is the four year anniversary of that tragic day and a commemorative ceremony is scheduled at the Miami-Dade Police Department Fred Taylor Headquarters Building, located at 9105 NW 25th Street in Doral.

It’ll take place at the butterfly garden located in front of the Headquarters Building starting at 9:00 a.m.

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The ceremony is a chance for loved ones and colleagues to take pause and remember officer Haworth and Castillo’s ultimate sacrifice.