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1) ‘Person of interest’ = one who involves the interest of the case?
2) KSN-TV = ? What does "KSN" stand for?

Context:

‘Person of interest’ questioned in BTK killings
Wichita, Kan., police descend on home to conduct interview
MSNBC staff and news service reports
Updated: 4:39 p.m. ET Feb. 25, 2005

WICHITA, Kan. - Police detectives were interviewing "a person of interest" Friday in the so-called “BTK Killer” case, a possible break in the serial murder spree that has bedeviled investigators for more than 20 years.

NBC affiliate KSN-TV reported that a number of law enforcement personnel, including members of the Wichita Police Department bomb squad, had descended on a residence in Park City, where the person lives.
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A person of interest is someone who is believed to have information about a crime -- possibly, but not necessarily, a person suspected of having committed the crime. If the police have enough evidence that this person actually committed the crime, they usually call the person a suspect. So "person of interest" is a step below "suspect".

KSN-TV probably means Kansas State Network - Television. Such station identifiers are called call letters.

[url="http://www.oldradio.com/archives/nelson/origins.html "]Here's some interesting links on call letters.[/url]

CJ
Comments  
Thank you CJ.