"...He told me that he'd killed you, and that you didn't see it coming. At first. As we talked, it...became clearer that it was a decision you'd made together."
He clears his throat.
"To deal with your shoulder, I'm assuming."
Other options:
no subject
"...He told me that he'd killed you, and that you didn't see it coming. At first. As we talked, it...became clearer that it was a decision you'd made together."
He clears his throat.
"To deal with your shoulder, I'm assuming."