4) Biro’s birthday is celebrated as Inventors Day In Argentina, where Biro began mass producing his ballpoint pens his birthday – 29 September – is celebrated as Inventor’s Day.

David Biro, the Winnetka teen convicted last month of killing Richard and Nancy Langert in their townhouse in the North Shore suburb, was sentenced Friday to spend his life in prison for the murders.

Uncovering David Biro's past 03:40. A Cook County judge ruled Thursday that Biro's "discretionary" life sentence for the intentional homicide of an unborn child was not covered by a 2014 state ...

David Biro is serving a life sentence for the 1990 murders he committed when he was 16. It was an emotional day for the loved ones of Nancy and Richard Langert, the couple who was murdered in 1990 ...

Cook County judge delays ruling on fate of convicted killer David Biro 01:26. CHICAGO (CBS) --A Cook County judge will wait until the end of the month to decide whether convicted killer David Biro ...

Biro was convicted of killing Langert and her husband, Richard, in their Winnetka townhouse in April 1990. At the time, Biro was a 16-year-old student at New Trier High School.