Matthew Stalker, 49, is accused of using a high tech device in an attempt to monitor activity on a computer at the UT Health Science Center.

UT System police said an employee noticed the device, known as a “Key Grabber”, on the back of a publicly accessible computer in the library last Saturday.

According to an arrest warrant affidavit, a Key Grabber monitors the key strokes on a computer, and is able to detect and capture information such as passwords.

The affidavit stated that police discovered the device had captured about a dozen personal passwords from the UTHSC computer.

Police said Stalker was seen hanging around the computer the following day, acting strangely, and appeared to be searching for something on the back of the machine, the affidavit stated.

They said they also obtained information from the store where the device was sold showing that Stalker is the person who purchased it.

He was arrested Thursday on a charge of breaching computer security.

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