The Latest on the fatal shooting of an heating oil company worker in Londonderry, New Hampshire (all times local):

10:30 a.m.

The widow of a New Hampshire heating oil company worker says she's not aware of any previous contact between her husband and a homeowner accused of killing him.

Investigators say the Londonderry homeowner fatally shot an oil company employee who came to his house to do work on Tuesday before trying to kill himself. Authorities haven't released either of their names, but the worker's wife, Carole Rabideau, of Manchester, told WMUR-TV (http://bit.ly/1TzBMpr) that her husband was killed.

Carole Rabideau says her husband, Daniel, was 59 years old and had a son, four stepchildren and 11 grandchildren. She says he didn't deserve to die.

The homeowner was taken to a hospital in Massachusetts, where he's listed in critical condition.

___

1:04 a.m.

Authorities say a New Hampshire man fatally shot a heating oil company employee who came to his house to do work before trying to kill himself and engaging in an hours-long standoff with police.

Police and SWAT team members responded to the home in Londonderry on Tuesday. The neighborhood was evacuated and several schools were placed on lockdown due to the police activity.

Neighbors told police that a City Fuel van pulled up to the home and they heard gunfire a short time later. Investigators say the employee was killed. The homeowner was taken to a hospital in Massachusetts, where he's listed in critical condition.

Investigators have not released either of their names.

It's unclear what sparked the shooting.