Joanna Kerrich married, first, John Jessup. After his death, Joanna married, second, John Whitmore about 1640 in Stamford, Connecticut. John Whitmore was killed while tending his cattle in 1648. It was suspected that he was murdered by Indians, which led to a war against the Indians. See find-a-grave page for John Whitmore. The find-a-grave site for Joanna (Kerrich) Whitmore (and wikitree page which relies on it) states that Whitmore Family Records say that Joanna continued to live on the Whitmore farm until here death in her 48th year.
HOWEVER, in 1662, Taphanse, the Indian suspected as having killed Whitmore, was brought to trial. In the trial, Anne Akerly, widow (widely assumed to be then the widow of Henry Ackerly) gave a deposition in which she stated that she was about 75 years old and that on the afternoon that goodman Whitmore was killed, "shee did see the Indian called Taphanse at goodman Whitmores house with other Indians, & ye sd Taphanse shooke her (the wife of goodm Whitmore) by ye hand . . ." Link to deposition
Doesn't this seem to mean that, after John Whitmore died, Joanna (Kerrich) Whitmore married Henry Ackerly and was the Anne Akerly who testified? I am not aware of any contrary evidence except the reference to "Whitmore Family Records" on the find-a-grave cite, which I find less persuasive than the deposition.