(DAILYMAIL) — A retired NASA employee allegedly drove 250 miles to seek out and kill her husband’s lover after he said he wouldn’t leave her.

Shannon O’Roark Griffin, 52, drove nearly four hours from her home in Lyons, Kansas, to the house of psychiatrist Irina Puscariu in Gladstone, Missouri.

She then knocked on the door before entering and shot Ms. Puscariu three times, say police.

O’Roark Griffin and her husband Roscoe Griffin, who was a retired Army colonel, were undergoing couple’s therapy because of problems in their marriage.

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