Winning the Widow's Heart (Prairie Courtships, #1)

In the Care of the Lawman 

When Texas Ranger Jack Elder stormed the isolated Kansas homestead, he expected to find a band of outlaws. Instead, the only occupant is a heavily pregnant woman-and she's just gone in to labor. A loner uneasy with emotion, Jack helps deliver widow Elizabeth Cole's baby girl and can't get back on the trail fast enough. The robber and murderer he's after killed one of Jack's own, and he vows to catch the man. But when he returns to check on Elizabeth and her little one, he discovers that she may hold the key to his unsettled past-and his hoped-for future.