She reported for Today Tonight on the Seven Network, then worked as a producer for APTN and Access Hollywood in London.
She has a Bachelor of Communications from Charles Sturt University, Bathurst, majoring in broadcast journalism.
In May 2020, Tynan was made redundant from Sky News Australia after 18 years with the network.
In an interview on Today Tonight on 6 August 2007 she revealed that she has a fear of getting married, because her parents had a bad marriage.
She is the grand-niece of John O'Grady (Nino Culotta) who wrote the best-selling They're a Weird Mob.