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We present a catalog of spectroscopic redshifts for SPT-CLJ0615$-$5746, themost distant cluster in the Reionization Lensing Cluster Survey (RELICS). UsingNod & Shuffle multi-slit observations with LDSS-3 on Magellan, we identify${\sim}50$ cluster members and derive a cluster redshift of $z_c = 0.972$, witha velocity dispersion of $\sigma = 1235 \pm 170\ \textrm{km}\ \textrm{s}^{-1}$.We calculate a cluster mass using a $\sigma_{200}-M_{200}$ scaling relation of$M_{200} = (9.4 \pm 3.6) \times 10^{14}\ M_\odot$, in agreement with previous,independent mass measurements of this cluster. In addition, we examine thekinematic state of SPT-CLJ0615$-$5746, taking into consideration priorinvestigations of this system. With an elongated profile in lensing mass andX-ray emission, a non-Gaussian velocity dispersion that increases withclustercentric radius, and a brightest cluster galaxy not at rest with the bulkof the system, there are multiple cluster properties that, while notindividually compelling, combine to paint a picture that SPT-CLJ0615$-$5746 iscurrently being assembled.

Assembling a RELIC at Redshift 1: Spectroscopic Observations of Galaxies in the RELICS Cluster SPT-CLJ0615-5746