Calumet County Sergeant William Tyson testified in Steven Avery's 2007 trial about RAV4 security and his assignment to document a search of Avery's residence by Manitowoc County officers. Cross-examination established that he had not watched every movement and was absent from the later search when he understood a key was found.
Law enforcementCalumet County Sheriff's Department
William Tyson
Calumet County sergeant who documented property searches and handled evidence involving the RAV4.
735 lines·20 proceedings·15 mentions·2 trials
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Calumet County Sergeant William Tyson testified in both prosecutions about searches connected to Steven Avery's residence and Teresa Halbach's RAV4. He described documenting the initial residence or trailer search, taking custody of collected evidence, and helping secure the RAV4. In Avery's trial, he characterized the first search as quick rather than thorough, said he did not observe every movement of the officers he accompanied, and distinguished it from the later search when he understood a key was found. He also reported no headboard marks consistent with restraints secured there and specified negative blood-related findings. In Dassey's trial, Tyson discussed photographed items, restraints found by another officer, firearms left for a later search, and his swab of the RAV4's exterior hood latch. Cross-examination tested evidence-handling choices and possible DNA transfer; Tyson acknowledged a general possibility of transfer without identifying an occurrence and could not say how the Crime Lab had handled the vehicle before his swab.
Trial Record (20)
Sergeant William Tyson testified on Day 2 of Brendan Dassey's 2007 trial about searches of Steven Avery's trailer and his swab of Teresa Halbach's RAV4 hood latch. Cross-examination tested evidence-handling practices and the limits of what he could establish about possible DNA transfer and the vehicle's earlier handling.
Day 2
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