THE utter devastation of losing a mother of six, grandmother of 11 and foster parent of three was felt through victim impact statements after the details of the woman’s tragic death were read in the Supreme Court.

The words of daughters Kristy Pearce and Rebecca Flanagan and husband John Flanagan expressed grief at the loss of their mother and wife, Maureen Ann Flanagan, 54.

Her daughters expressed ‘‘heartbreaking pain’’ together with the words of a young grandchild: ‘‘Does grandma know I miss her?’’

‘‘Maureen was the glue that held us all together,’’ Mr Flanagan’s words read.

Drugged, drunk hoon David Johnathan Holmyard, 26, killed Mrs Flanagan when he hit her car at 170km/h at Western Junction on November 7, 2014.

Mrs Flanagan was turning her Nissan Navara dual-cab utility into the driveway of her home in Evandale Road when Holmyard’s Ford Falcon XR6 sedan slammed into her front driver’s side door.

Holmyard, formerly of Evandale, went to trial in the Supreme Court in Launceston on Thursday over the motor manslaughter, but changed his plea to guilty on Friday.

Crown prosecutor Linda Mason told the court on Monday that a back calculation estimated Holmyard’s blood-alcohol level would have been between 0.096 and 0.112 when he decided to drive at 8.37pm.

Holmyard evaded police as he left Evandale, crossed onto the wrong side of Evandale Road, drove for about 175metres and became airborne at 174km/h.

Holmyard remained airborne for 21metres and landed, still on the wrong side of the road, 64metres away from where Mrs Flanagan was turning into her driveway.

It took the out-of-control Holmyard a further 1.34 seconds to hit Mrs Flanagan and he made no effort to avoid the crash.

A blood test about an hour later showed Holmyard had a blood-alcohol level of 0.086, as well as 10 micrograms of cannabis and 0.02 milligrams of methylamphetamine in his system.

‘‘The combination of alcohol and THC in his blood would have significantly impacted his ability to drive,’’ Ms Mason said.

‘‘The presence of methylamphetamine would not have countered the effect of the other two drugs in combination.’’

Ms Mason read the three victim impact statements from the Flanagan family to the court.

Defence counsel Mark Doyle requested an adjournment of his plea in mitigation to allow the preparation of a pre-sentence report through Forensic Mental Health Services.

Mr Doyle said a psychologist had diagnosed Holmyard with post-traumatic stress disorder.

Justice Robert Pearce ordered a report from the chief forensic psychiatrist.

He further remanded Holmyard in custody and ordered him to reappear on February 1 at 2.15pm.