3:00
Media reports last year claimed that the door was not properly secured but was kept in the Boschkop Police Station Commander's office for quite some time
Vermuelen said \"something\" happened to the door after it was photographed on March 8 last year but he was unable to say what exactly occurred.
The colonel was also shown a photo of what appeared to be a police boot print on the door, suggesting the key piece of evidence had been tainted by sloppy police storage.
![\"PHOTO:](\"http://a.abcnews.com/images/International/GTY_pistorius_bathroom_2_kab_140312_4x3t_384.jpg\")
![\"PHOTO:](\"http://a.abcnews.com/images/International/GTY_pistorius_bathroom_1_kab_140312_4x3t_384.jpg\")
Vermuelen is expected to return to the stand on Thursday for cross-examination.
The trial of Pistorius, 27, is being billed as the \"trial of the century\" in South Africa. If the athlete is convicted of murder, he could be sentenced to at least 25 years in prison before he is eligible for parole.
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