Unfortunately for you it’s a grass and any herbicide which will kill it will also kill any other grass in your lawn,

A gardener threw this down when we asked him to over-seed. I've read about gardeners throwing down cheap seeds and even weeds that look like grass. It looks like I will have to rip up the entire lawn front and back and start with new soil and grass seed.

Possibly Lolium multiflorum, annual or Italian ryegrass.

There are some grass selective herbicides that can be used in relative safety on an established lawn to control grass-like weeds - Fusilade, Poast, etc. Also a pre-emergent containing sulfometuron may be helpful.

By "relative safety" I mean that it is unlikely to have a seriously damaging effect on the established lawn.

Dear Gardengal48. Fusilade has two products. The Fusilade II and the DX. Can you recommend one over the other? I will test it in a patch of grass to see if it kills the rest of the healthy grass. THANK YOU!

Fusilade II is intended for use on lawns and other grassy areas. DX is intended for use with other crops. But they both contain the same active ingredient and in the same concentration.