[2] In 2002, Howlett was sentenced to 6 months' imprisonment for instigating an aggravated assault on rival gang members Steven Maxwell and Brett Hynes.
On 8 March 2000, Howlett, a criminal associate named Joseph Andrew Tonner, went to the Government Analytical & Forensic Laboratory with an explosive device and two tins of petrol.
The purpose of doing so was said by the prosecution to be to destroy evidence believed to be in the laboratory, that would lead to the conviction of Graeme Hall for trafficking in a substantial quantity of amphetamine.
[5] Howlett received 2 years' imprisonment with 20 months suspended, with Justice Peter Underwood noting, "I have not heard such convincing evidence of self-motivated rehabilitation by a prison inmate".
[7] On 24 June 2018, Howlett, accompanied by another man and with his face smeared with war paint, went to Pablo's Cocktail Bar in central Hobart.