  `Strange metals' with resistivity depending linearly on temperature $T$ down
to low-$T$ have been a long-standing puzzle in condensed matter physics. Here,
we consider a model of itinerant spin-$1/2$ fermions interacting via on-site
Hubbard interaction and random infinite-ranged spin-spin interaction. We show
that the quantum critical point associated with the melting of the spin-glass
phase by charge fluctuations displays non-Fermi liquid behaviour, with local
spin dynamics identical to that of the Sachdev-Ye-Kitaev family of models. This
extends the quantum spin liquid dynamics previously established in the
large-$M$ limit of $SU(M)$ symmetric models, to models with physical $SU(2)$
spin-$1/2$ electrons. Remarkably, the quantum critical regime also features a
Planckian linear-$T$ resistivity associated with a $T$-linear scattering rate
and a frequency dependence of the electronic self-energy consistent with the
Marginal Fermi Liquid phenomenology.
