BTK suspect Dennis Rader pleaded guilty yesterday to 10 counts of first-degree murder, admitting in a chillingly matter-of-fact voice to a series of slayings that terrorised the city beginning in the 1970s.

The serial killer known as BTK today pleaded guilty to 10 counts of murder, admitting in a chillingly matter-of-fact voice to a series of slayings that terrorised a US city for years.

More than 30 years after the first killings that began a reign of terror in a US city, the man accused of being the so-called “BTK strangler” is expected to plead not guilty this week.

The man suspected of 10 murders attributed to the "BTK" serial killer confessed to at least six of the killings, a source with direct knowledge of the investigation said today.